U.S. Air Force Airmen stand in formation during a retreat ceremony recognizing the thirteenth anniversary of the Sept. 11, 2001, at Al Udeid Air Base, Qatar, Sept. 11, 2014. 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 by Senior Airman Colin Cates)