An honor guard comprised of first responders waits for the start of the 9/11 Remembrance Ceremony at Joint Base Andrews, Md., on Sept. 10, 2021. The large flag was set up between fire trucks to honor the first responders who lost their lives due to the 9/11 terrorist attacks on the United States 20 years ago on Sept. 11, 2001. (U.S. Air Force photo by Staff Sgt. Jared Duhon)