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An Airman with the 319th Security Forces Squadron, far right, U.S. Customs and Border Protection agent, and officers with the Grand Forks Sheriff’s Department form up outside of Carl Ben Eielson Elementary School in preparation to enter an active-shooter scenario Aug. 10, 2017, on Grand Forks Air Force Base. The training exercise was held to allow the members to practice room clearing procedures, rear security and communication in order to apprehend potential shooters. (U.S. Air Force photo by Airman 1st Class Elora J. Martinez)
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