U.S. Staff Sgt. Christopher Costa, far right, 10th Intelligence Squadron, directs U.S. Navy Lt. Cmdr. Sidney Martin while he locks Airman 1st Class Cole Bonack, 633rd Aeromedical Squadron ophthalmic technician, into an arm bar position during a Jui-Jitsu class at Langley Air Force Base, Va., May 1, 2012. Costa is the Brazilian Jui-Jitsu instructor for Joint Base Langley-Eustis. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)