U.S. Air Force Airman 1st Class Cole Bonack, left, 633rd Aero Medical Squadron ophthalmic technician, and Senior Airman Shane McNaughton, 1st Maintenance Squadron munitions technician, demonstrate attack and block maneuvering during a Jui-Jitsu class at Langley Air Force Base, Va., May 1, 2012. Brazilian Jiu-Jits, is a self-defense system focused on grappling and ground fighting. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)