Petty Officer 3rd Class Justin Turnbough, an auxiliary machinery watchstander and electrician’s mate in the Coast Guard Cutter Polar Star’s engineering department, trains Petty Officer 2nd Class Gavin Dunaway, an electrical technician, while underway in McMurdo Sound, Antarctica, Jan. 10, 2016. The auxiliary machinery watchstander inspects and keeps logs of most of the machinery in the icebreaker. (U.S. Coast Guard photo by Petty Officer 2nd Class Grant DeVuyst)
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