U.S. Air Force Master Sgt. Ryan Mclain, the noncommissioned officer in charge of combat arms training and maintenance assigned to the 633rd Security Forces Squadron, assists an Airman during qualifications on the M-4 Carbine at Langley Air Force Base, Va., March 8, 2016. Airmen shoot from different positions as well as with their gas mask on in order to successfully demonstrate the necessary requirements. (U.S. Air Force photo by Senior Airman Brittany E. N. Murphy)