Staff Sgt. Tamika Lindsey, 25th Aircraft Maintenance Unit load master, reviews system operational guidelines with her crew during the first night of Vigilant Ace 16 at Osan Air Base, Republic of Korea, Nov. 2, 2015. Vigilant Ace is a peninsula-wide readiness exercise geared toward strengthening the interoperability of the alliance. ( Air Force photo/Staff Sgt. Amber Grimm)

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Keywords: 16, ace, vigilant