U.S. Air Force Staff Sgt. Juan Carrillo Lopez, 633rd Security Forces Squadron, Base Defense Operations Center operator adjusts his grip on his weapon after completing a high crawl to a defense position during Combat Readiness Training at Langley Air Force Base, Va., June 27, 2016. CRT is a two-day course that sharpens basic field tactics for deploying SF Airmen. (U.S. Air Force photo by/Tech. Sgt. Daylena S. Ricks)