Staff Sgt. David Guba, a mixed military combatives instructor, demonstrates maneuvers during a Mixed Military Combatives class at Langley Air Force Base, Va., Dec. 6, 2011. Based on the Modern Army Combatives Program, the program is designed to arm Airmen with the skills to protect themselves in case they are unarmed and in close combat with an enemy. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)