Marine PT
Marine Corps Gunnery Sgt. Virgil Cain, Center for Naval Aviation Technician Training detachment manager, performs a knee thrust on Lance Cpl. Leonardo Del Rosario, a C-130 engine mechanic, during a combat fitness training exercise, Oct. 5, 2011, at Little Rock Air Force Base, Ark. Combat fitness training is a circuit of two-minute drills that prepare Marines for combat conditioning and readiness. (U.S. Air Force photo by Senior Airman Caleb Pierce)