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U.S. Marines with Marine Attack Squadron (VMA) 311 inspect and conduct maintenance on an AV-8B Harrier during Exercise MAX THUNDER 17 at Kunsan Air Base, Republic of Korea, April 18, 2017. Max Thunder serves as an opportunity for U.S. and ROK forces to train together and sharpen tactical skills for the defense of the Asia-Pacific region. It is an annual military-flying exercise built to promote interoperability between U.S. and ROK forces.