51 SFS practice active shooter school scenario
Staff Sgt. Carl Higgins, 51st Security Forces Squadron patrolman, clears a classroom for threats during an active shooter exercise at Osan Air Base, Republic of Korea, Nov. 13, 2014. All Osan Schools conducted a lockdown/shelter in place drills simultaneous to the active shooter exercise. (U.S. Air Force photo by Senior Airman Matthew Lancaster)

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Photo by: Senior Airman Matthew Lancaster |  VIRIN: 141113-F-HG907-094.JPG