Active-shooter exercise tests first responders
U.S. Air Force members from the 100th Security Forces Squadron use a plotting board at a temporary control point to provide information, including a safe route for other first responders, to the base defense operations center Aug. 25, 2015, during an exercise on RAF Mildenhall, England. As part of an emergency lockdown exercise, a simulated armed assailant was on base testing service members’ reactions to the scenario. (U.S. Air Force photo by Karen Abeyasekere/Released)

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Photo by: Karen AbeyasekereReleased |  VIRIN: 150825-F-EJ686-085.JPG