Missouri Airmen train with machine guns
U.S. Staff Sgt. Troy Green (left), a combat arms instructor with the 139th Security Forces Squadron, Missouri Air National Guard, gives instruction to Chief Master Sgt. Mark Richie, while firing a M2 50-caliber machine gun, during a live-fire training exercise at Fort Riley, Kan., June 7, 2017. The live-fire machine gun training is an annual requirement for members of security forces and support personnel. (U.S. Air National Guard photo by Tech. Sgt. Christopher Black)