Exercise Vigilant Ace 18 kicks off
U.S. Air Force Airmen confer on the flightline during exercise Vigilant Ace 18 at Osan Air Base, Republic of Korea. The exercise provides realistic air combat training for the United States and Republic of Korea, testing and refining the readiness and interoperability of US-ROK forces to deter aggression and provide a rapid response to attack. (U.S. Air Force photo by Staff Sgt. Alex Fox Echols III)

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Photo by: Staff Sgt. Alex Fox Echols III |  VIRIN: 171202-F-DY859-0149.JPG