51st SFS defends the base
Airmen from the 51st Security Forces Squadron discuss operational requirements during Exercise Vigilant Ace 16 on Osan Air Base, Republic of Korea, Nov. 2, 2015. More than 16,000 U.S. personnel will participate in Vigilant Ace 16, an annual exercise that tests the linkage between operational-level planners and tactical units, including an increased ROK air force presence. (U.S. Air Force photo/Tech. Sgt. Travis Edwards)

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