American flags fly at half staff around the Washington Monument on the National Mall to mark the 22nd anniversary of the terror attacks on September 11, 2023 in Washington, DC. U.S. Leaders are observing the anniversary around the country with first lady Jill Biden attending a ceremony at the National 9/11 Pentagon Memorial and U.S. President Joe Biden speaking to service members in Alaska. (Photo by Anna Moneymaker/Getty Images)