Active-shooter exercise tests first responders
Emergency responders prepare to enter a building after a simulated active shooter incident during an exercise Aug. 25, 2015, on RAF Mildenhall, England. The exercise tested 100th Security Forces Squadron, 100th Civil Engineer Squadron Fire Department and 48th Medical Group personnel on their response to an active shooter incident. (U.S. Air Force photo by Karen Abeyasekere/Released)

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Photo by: Karen AbeyasekereReleased |  VIRIN: 150825-F-EJ686-069.JPG