Red smoke from an M18 Smoke Grenade clouds the air in front of the fitness center May 12, 2015, at Osan Air Base, Republic of Korea. The smoke signified the start of a mass causality exercise as part of the readiness exercise Beverly Midnight 15-02. The exercise helps identify areas where procedures should be changed or equipment added in order to enhance the emergency response capabilities. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)
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