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OSAN AIR BASE, Republic of Korea -- (From left to right) Sankil Pak, 51st Civil Engineer Squadron firefighter, assists Senior Airman Ryan Clevenger, 51st Aircraft Maintenance Squadron weapons loader, during a base-wide mass casualty exercise Nov. 3. The exercise tests base personnel's ability to transition from peacetime to wartime operations, execution of the mission in a war time environment, and response time to major accidents and natural disasters. (U.S. Air Force photo/Staff Sgt. Lakisha Croley)