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Police officers practice room clearing procedures during a training scenario Sept. 3, 2015 at Carl Ben Eielson Elementary School on Grand Forks Air Force Base, North Dakota. Nearly two dozen law enforcement officers from various agencies across the region came together here during the first week of September 2015 for some classroom and hands-on training dealing with a variety of active shooter scenarios. (U.S. Air Force photo/Staff Sgt. Susan L. Davis)
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