U.S. Air Force Staff Sgt. Charles Duval, 633rd Security Forces Squadron base defense operations center controller, fires an M-4 carbine at a target at Fort Eustis, Va., Oct. 30, 2014. SFS Airmen performed night fire training as a way to maintain proficiency in firing during low-light situations. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)