An airman first class assigned to the 60th Security Forces Squadron works to clear a building during an active shooter training event April 13, 2016, at Travis Air Force Base, California. The active shooter training took place at the installation’s newly constructed Emergency Responder Urban Training Site. ( Air Force photo by Staff Sgt. Charles Rivezzo)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: afb, air, airmen, base, enforcement, force, forces, law, m4, military, police, security, training, travis