Staff Sgts. Ryan Michaels, Courtney Brock and Luke Frazier, 99th Security Forces Squadron training instructors, monitor an active shooter exercise in the 99th SFS shoot house, Aug. 13, 2012, at Nellis Air Force Base, Nev. Cameras mounted on the walls enable instructors to see everything that happens during each scenario, even in total darkness.
William Coleman
Taken on 13 August 2012
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