Staff Sgt. Richard Leslie, left, and Staff Sgt. Jacob Sime, both 75th Security Forces Squadron, respond to a report of an active shooter and explosives during a response exercise at building 732, Hill Air Force Base, April 24. The realistic scenario involved a shooter and hostages inside the building, while outside the building an explosive device was planted at each entrance.

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Photo credit: © Ted Small / Alamy / Afripics
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