U.S. Air Force Staff Sgt. James Bartee, 633rd Security Forces Squadron Combat Arms Training and Maintenance instructor, assists Staff Sgt. Charles Duval, 633rd SFS base defense operations center controller, with making sight corrections to an M-4 carbine at Fort Eustis, Va., Oct. 30, 2014. Instructors guided 633rd SFS personnel in firing the M-4 carbine and M-9 pistol throughout various live-fire exercises. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)