Tech. Sgt. Charles Roberts, Keen Edge combat airspace manager from the 374th Operations Support Squadron, coordinates airspace requirements with his Japan Air Self-Defense Force counterpart, 1st Lt. Keisuke Nakajima, during Keen Edge '10 Jan. 25, 2010 at Yokota Air Base, Japan. Exercise participants practice responding to various events to increase combat readiness and interoperability of U.S. forces and Japan Self-Defense Forces. (U.S. Air Force photo/Capt. Will Powell)