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Active Shooter Exercise
Master Sgt. Thomas Carpino, 28th Security Forces operations section chief, searches for threats during an active shooter exercise at Ellsworth Air Force Base, S.D., Aug. 12, 2014. The exercise focused on preparing defenders to rapidly respond, identify the target, eliminate the threat and to secure the installation. (U.S. Air Force photo by Senior Airman Zachary Hada/Released)

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Photo by: Senior Airman Zachary HadaReleased |  VIRIN: 140812-F-HK400-131.JPG