U.S. Air Force Airman 1st Class Khae Spotted Calf, 27th Special Operations Medical Support Squadron, fends off an opponent Dec. 11, 2013 during the Closed Combat Course at Cannon Air Force Base, N.M. The course teaches basic closed combat skills, but also prepares trainees to become close combat instructors so that they may spread their knowledge throughout the military branches. (U.S. Air Force photo/Senior Airman Ericka Engblom)