150715-N-OI810-098 PACIFIC OCEAN (July 15, 2015) MH-60S Sea Hawk helicopters assigned to the Black Knights of Helicopter Sea Combat Squadron (HSC) 4 transfer supplies during a replenishment-at-sea from the Military Sealift Command fleet replenishment oiler USNS Yukon (T-AO 202) to the aircraft carrier USS Ronald Reagan (CVN 76). Ronald Reagan is underway off the coast of Southern California. (U.S. Navy photo by Mass Communication Specialist 3rd Class Nathan Burke/Released)