U.S. Air Force Airmen begin to fold an American flag during a retreat ceremony recognizing the fourteenth anniversary of Sept. 11, 2001, at Al Udeid Air Base, Qatar, Sept. 11, 2015. The retreat ceremony signals the end of the official duty day and serves as a ceremony for paying respect to the flag. In this ceremony, respect was paid to the flag and the memory of those lost on Sept. 11, 2001. (U.S. Air Force photo/Tech. Sgt. Rasheen Douglas)