A 51st Security Forces Squadron Airman takes a look around the corner of a tactical vehicle used as concealment during Operational Readiness Exercise Beverly Bulldog 14-01 at Osan Air Base, Republic of Korea, Nov. 20, 2013. Defenders used tactical vehicles during the attack scenario to form a defensive fighting position. (U.S. Air Force photo by Airman 1st Class Ashley J. Thum/Released)
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