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Air Force Col. Mark Kling, 7th Air Force chief of staff, briefs participants of Exercise Key Resolve at the base theater March 11, 2013 at Osan Air Base, Republic of Korea. Key Resolve is an annual exercise to improve the capacity of the alliance between the United States and the Republic of Korea to deter aggression and reinforce the United States' commitment to the Republic of Korea. (U.S. Air Force photo/Staff Sgt. Zachary Wolf)