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Hon. Mark Lippert, U.S. ambassador to the Republic of Korea (ROK), highlights the strength of the ROK and U.S. alliance during a visit to the ROK Fleet base in Busan, Jan. 9, 2017. During the visit, Lippert, who was appointed in Oct. 2014, took time to thank more than 150 ROK and U.S. naval personnel for their combined service and support of regional security.