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U.S. Air Force and Republic of Korea Airmen empty concrete into a crater during a Rapid Airfield Damage Repair bilateral training exercise at Gwangju Air Base, R.O.K., Nov. 9, 2017. U.S. and R.O.K. Airmen trained together for a week to learn the new RADR process, preparing them for response to wartime contingencies, enhancing interoperability and building partnership capacity in the Indo-Asia Pacific region.