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Staff Sgt. Timothy Ethridge, a 73rd Expeditionary Air Control Squadron aerospace ground equipment supervisor, teaches his Jiu Jitsu class members the Americana technique, a shoulder joint lock, here at the Freedom Gym at Kandahar Airfield, Afghanistan, May 29, 2012. The Jiu Jitsu class improves the core and relieves stress. Jiu Jitsu concentrates on some stand-up moves but mostly centers on taking the opponent to the ground. (U.S. Air Force photo/Staff Sgt. Heather Skinkle)
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