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A U.S. Air Force F-22 "Raptor" fighter aircraft from Kadena Air Base, Japan, is flanked by an F-16 Fighting Falcon and a Republic of Korea air force F-15 Slam Eagle at Osan Air Base, ROK, Feb. 17,2016. The Raptor was part of a flyover formation of 12 aircraft demonstrating the strength of the ROK/U.S. alliance in response to recent provocative actions by North Korea. (U.S. Air Force photo by Staff Sgt. Amber Grimm/Released)