Staff Sgt. Issac McCauley, 436th Security Forces Squadron, stands guard in the George S. Welch Elementary School during an active shooter exercise Feb. 26, 2018, at Dover Air Force Base, Del. All responding defenders exchanged their duty weapons and ammunition for blue training replicas at the beginning of the exercise. (U.S. Air Force photo by Airman 1st Class Zoe M. Wockenfuss)
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