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SOUTH CHINA SEA (June 14, 2015) An MH-60S Sea Hawk helicopter attached to the Blackjacks of Helicopter Sea Combat Squadron (HSC) 21 lifts pallets of supplies from the flight deck of the Military Sealift Command fleet replenishment oiler USNS Walter S. Diehl (T-AO 193) during a vertical replenishment with Wasp-class amphibious assault ship USS Essex (LHD 2). The Essex Amphibious Ready Group is operating in the U.S. 7th Fleet area of responsibility.