Staff Sgt. Christopher McAleer, 620th Ground Combat Training Squadron formal training instructor, armed with an M-249 loaded with blank rounds, looks through a window during a training exercise at Camp Guernsey, Wyo., Oct. 17, 2014. McAleer and other 620th GCTS training instructors played opposing-force gunmen in training exercises during the Nuclear Convoy Course. (U.S. Air Force photo by Senior Airman Jason Wiese)