U.S Air Force Airman 1st Class Markel Collins, an entry controller assigned to the 6th Security Forces Squadron, secures a gunman with handcuffs during an active shooter exercise at MacDill Air Force Base, Fla., April 17, 2017. Communication was key between the responding emergency team to ensure the incident was deescalated. (U.S. Air Force photo by Airman 1st Class Adam R. Shanks)
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