Senior Airman Tijon North, a response force leader assigned to the 28th Security Forces Squadron, assembles an M4 carbine rifle during a training session at Ellsworth Air Force Base, S.D., Oct. 6, 2016. The mission of Combat Arms Training and Maintenance is to insure that anyone who needs to arm with lethal weapons are qualified and know the operations and proper procedures of the equipment they are using. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)