PACIFIC OCEAN – An aircraft handler aboard USS San Diego (LPD 22) directs an MH-60 Seahawk carrying supplies to the flight deck during a Replenishment-at-Sea evolution of Certification Exercise, June 8, 2017. RAS operations are conducted to resupply and refuel ships while at sea for extended periods of time. CERTEX is the third and final at-sea training period to certify the 15th Marine Expeditionary Unit and America Amphibious Ready Group in preparation for their upcoming deployment. ( Marine Corps photo by Cpl. Timothy Valero)

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