9/11 retreat
Senior Airman Bryan Schwinn, 92nd Civil Engineer Squadron firefighter, rings a ceremonial firefighter's bell at a retreat ceremony at Fairchild Air Force Base, Wash., Sept. 11, 2015. Traditionally three bells are sound in remembrance of those who can no longer respond to the call due to the Sept. 11, 2001, tragedy 14 years ago. (U.S. Air Force photo/Airman 1st Class Taylor Bourgeous)