Senior Airman Christopher Hahn, 51st Security Forces Squadron defender, heads toward fellow defender after clearing a building of possible enemy threats during a counter surveillance scenario for operation readiness exercise Beverly Bulldog 13-02 at Osan Air Base, Republic of Korea, Feb. 12, 2013. Counter surveillance scenarios are conducted to help train security forces Airmen to deny opposing forces entry to the base. (U.S. Air Force photo/Staff Sgt. Sara Csurilla)
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