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Members of the 50th Security Forces Squadron team line up in a diamond formation behind a crisis response shield during an active-shooter exercise on Schriever Air Force Base.


191120-F-UM970-0009

Members of the 50th Security Forces Squadron form a tactical “diamond formation” in response to a simulated active-shooter exercise during Opinicus Vista 19-3 at Schriever Air Force Base, Colorado, Nov. 20, 2019. Exercises give base personnel an opportunity to practice crisis response and remain prepared for real-world events. (U.S. Air Force photo by Kathryn Calvert)

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