153rd Airlift Wing security forces tests active shooter and lockdown procedures
U.S. Air Force Airmen assigned to the 153rd Security Forces Squadron clear a room in the headquarters building Dec. 18, 2015 at Cheyenne Air National Guard base in Cheyenne, Wyoming. The Airmen sweep the building looking for additional gunmen as part of an active shooter exercise. The scenario was in support of memorandum sent by Secretary of the Air Force Deborah James to test lockdown and active shooter procedures in response to shootings in Chattanooga, Tenn. (U.S. Air National Guard photo by Master Sgt. Charles Delano)
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