First responders stand at attention as the US flag is unfurled prior to an observance ceremony to honor the 184 people killed in the September 11, 2001 terrorist attack on the Pentagon, at the National 9/11 Pentagon Memorial in Washington, DC, on September 11, 2023. (Photo by ANDREW CABALLERO-REYNOLDS / AFP) (Photo by ANDREW CABALLERO-REYNOLDS/AFP via Getty Images)