Tech. Sgt. John Havens, 455th Expeditionary Security Forces Squadron, Check Six instructor, briefs a class on actions to take in case of an active shooter threat, Bagram Airfield, Afghanistan, Aug. 02, 2016. Check Six employs a 3+2+1 solution to teach individuals how to be react during an active shooter threat. There are three actions to choose; barricade, fight or escape, two outcomes; to survive or not and one chance to get it right. ( Air Force photo by Senior Airman Justyn M. Freeman)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
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