A squad of defenders from the 633rd Security Forces Squadron clear a mock control tower building while U.S. Air Force Master Sgt. Christopher Ricks, 633rd SFS, NCO in charge of training and U.S. Air Force Staff Sgt. Daniel Corral, 633rd SFS, instructor evaluates procedures used during Combat Readiness Training at Langley Air Force Base, Va., June 27, 2016. During the two-day course, SF students were taught; troop leading procedures, base security operations, detainee/enemy prisoner of war procedures, team movement procedures, land navigation, expeditionary entry control point operations, self-aid and buddy care and concluded with a field training exercise. (U.S. Air Force photo by/Tech. Sgt. Daylena S. Ricks)