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Senior Airmen Richard Arias and Jeren Grantham, Base Defense Operations Center controllers with the 319th Security Forces Squadron, take a water break after completing an active-shooter scenario during a training exercise at Carl Ben Eielson Elementary School Aug. 10, 2017 on Grand Forks Air Force Base, N.D. Groups of law enforcement officers, to include Airmen, took turns running through active-shooter scenarios set up by U.S. Customs and Border Protection supervisory agents. (U.S. Air Force photo by Airman 1st Class Elora J. Martinez)
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