U.S. Air Force Staff Sgt. Christopher Costa, right, 10th Intelligence Squadron link systems technician, traps U.S. Navy Lt. Cmdr. Sidney Martin into a locked arm-bar position during Jui-Jitsu training at Langley Air Force Base, Va., May 1, 2012. Costa, who was introduced to the art in 2006, is the instructor of a Brazilian Jui-Jitsu class at Joint Base Langley-Eustis. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)