180323-N-HE318-0198 SOUTH CHINA SEA (March 23, 2018) The Military Sealift Command fleet replenishment oiler USNS Walter S. Diehl (T-AO 193) conducts a replenishment-at-sea with the forward-deployed Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89). Mustin is on patrol in the U.S. 7th Fleet area of operation supporting security and stability in the Indo-Pacific region. (U.S. Navy photo by Mass Communication Specialist 2nd Class William McCann/Released)