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Republic of Korea air force F-15Ks from the 11th Fighter Wing, Daegu Air Base, ROK, prepare for flight as a KF-16 from the 20th Fighter Wing, Seosan Air Base, ROK takes off on the runway during Max Thunder 16 at Kunsan Air Base, Republic of Korea, April 18, 2016. Exercise Max Thunder is part of a continuous exercise program to enhance interoperability between U.S. and ROK forces.