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Staff Sgt. Gordon L. Williams, an infantry unit leader, looks out for great white sharks near Neptune Island Marine Park, South Australia, Australia, June 26, 2016. U.S. Marines and sailors with Marine Rotational Force – Darwin had the rare opportunity to dive with sharks before Exercise Hamel begins. Williams, from Homerville, Georgia, is with Company C, 1st Battalion, 1st Marine Regiment, MRF-D.