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