153rd Airlift Wing security forces tests active shooter and lockdown procedures
U.S. Air Force Master Sgt. Gregory Wardle, 153rd Security Forces Squadron, communicates with Airmen on the other side of a locked door, Dec. 18, 2015 at Cheyenne Air National Guard base in Cheyenne, Wyoming. Wardle and several security forces Airmen clear buildings and check for wounded after eliminating a gunman during 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)