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Biden to honor 9/11 victims as shadow of Afghan war looms

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden participates in a wreath laying at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First lady Jill Biden speaks during a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks at the Flight 93 National Memorial in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

First lady Jill Biden participates in a moment of silence with the members of the Association of Flight Attendants at the Flight 93 National Memorial Wall of Names following a ceremony commemorating the 21st anniversary of the Sept. 11, 2001 terrorist attacks in Shanksville, Pa., Sunday, Sept. 11, 2022. (AP Photo/Barry Reeger)

President Joe Biden speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Flowers are visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, during a ceremony to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. Standing with the President are Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs, Gen. Mark Milley. (AP Photo/Susan Walsh)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

Chairman of the Joint Chiefs, Gen. Mark Milley, speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

Defense Secretary Lloyd Austin speaks during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden stands during a moment of silence during a ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

President Joe Biden participates in a wreath laying ceremony while visiting the Pentagon in Washington, Sunday, Sept. 11, 2022, to honor and remember the victims of the September 11th terror attack. (AP Photo/Susan Walsh)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A flower is visible on one of the benches at the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

Visitors walk through the National 9/11 Pentagon Memorial outside the Pentagon in Washington, Sunday, Sept. 11, 2022, on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

President Joe Biden salutes as he boards Air Force One at Delaware Air National Guard Base in New Castle, Del., Sunday, Sep. 11, 2022. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan launched by the U.S. and its allies in response to the terror attacks. (AP Photo/Manuel Balce Ceneta)

First responders stand in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

U.S. Chairman of the Joint Chiefs of Staff Gen. Mark Milley, left, stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

A first responder stands in a driving rain as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

First responders salute as a U.S. flag is unfurled at the Pentagon in Washington, Sunday, Sept. 11, 2022, at sunrise on the morning of the 21st anniversary of the 9/11 terrorist attacks. (AP Photo/Andrew Harnik)

FILE - A Taliban fighter stands guard in the Shiite neighborhood of Dasht-e-Barchi, in Kabul, Afghanistan, Sunday, Aug. 7, 2022. Senate Minority Leader Mitch McConnell on Thursday, Sept. 8, criticized President Joe Biden's handling of the end of the war and noted that the country has spiraled under renewed Taliban rule since the U.S. withdrawal. (AP Photo/Ebrahim Noroozi, File)

FILE - An American flag is unfurled at the Pentagon in Washington, Saturday, Sept. 11, 2021, at sunrise on the morning of the 20th anniversary of the terrorist attacks. In the foreground, the National 9/11 Pentagon Memorial, opened in 2008 adjacent to the site, commemorates the lives lost at the Pentagon and onboard American Airlines Flight 77. (AP Photo/Alex Brandon, File)

FILE - President Joe Biden, first lady Jill Biden, Vice President Kamala Harris and her husband Douglas Emhoff, participate in a wreath ceremony on the 20th anniversary of the terrorist attacks at the Pentagon in Washington, Saturday, Sept. 11, 2021, standing at the National 9/11 Pentagon Memorial site, which commemorates the lives lost at the Pentagon and onboard American Airlines Flight 77. With the President, not shown, are Secretary of Defense Lloyd Austin and Joint Chiefs Chairman Gen. Mark Milley and his wife Hollyanne Milley. (AP Photo/Alex Brandon, File)

FILE - White roses adorn the National September 11 Memorial, Aug. 2, 2022, in New York. President Joe Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon on Sunday, Sept. 11, 2022. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan that was launched by the U.S. and allies in response to the terror attacks. (AP Photo/Julia Nikhinson, File)

FILE - A man walks with a child through Fort Bliss' Dona Ana Village where Afghan refugees are being housed, in New Mexico, Sept. 10, 2021. President Joe Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon on Sunday, Sept. 11, 2022. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan that was launched by the U.S. and allies in response to the terror attacks. (AP Photo/David Goldman, File)

FILE - President Joe Biden speaks about the end of the war in Afghanistan from the State Dining Room of the White House, Aug. 31, 2021, in Washington. Biden will mark the 21st anniversary of the Sept. 11 attacks at the Pentagon on Sunday, Sept. 11, 2022. Sunday's somber commemoration comes a little more than a year after the Democratic president ended the war in Afghanistan that was launched by the U.S. and allies in response to the terror attacks. (AP Photo/Evan Vucci, File)

Biden to honor 9/11 victims as shadow of Afghan war looms