Active-shooter exercise tests first responders
U.S. Air Force Staff Sgt. Roy Carter, right, 100th Security Forces Squadron Military Working Dog handler, checks an exercise inject for a victim of a simulated active shooter as MWD Luc helps him clear a room during an exercise Aug. 25, 2015, 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-EJ686-048.JPG