Airman 1st Class Nolan Dofredo, 90th Security Forces Squadron member, provides cover to fellow Airmen as they enter the base theater on F.E. Warren Air Force Base, Wyo., during an active shooter exercise Feb. 29, 2016. The defenders maintained several safety precautions during the exercise, including removing live ammunition and using training weapons. (U.S. Air Force photo by Airman 1st Class Malcolm Mayfield)
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