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Portrait of an active shooter

Col. Douglas Mellars, 422nd Air Base Group commander, speaks with Airmen about changing the leadership culture at RAF Croughton, United Kingdom, July 22, 2014. Several minutes into the commander’s call, Mellars was interrupted by a lone gunman enacting an active-shooter exercise. (U.S. Air Force photo by Staff Sgt. Jarad A. Denton/Released)

PHOTO BY: Staff Sgt. Jarad A. DentonReleased
VIRIN: 140722-F-UE958-007.JPG
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