Coast Guard Petty Officer 3rd Class Zebulun Kirk, a mechanic aboard Coast Guard Cutter Buckthorn, records the fuel tanks soundings to calculate how many gallons of diesel the cutter has in the tanks while moored in Sault Ste. Marie, Mich., Oct. 2, 2015. Buckthorn is a 100-foot inland buoy tender and is the oldest cutter on the Great Lakes. (U.S. Coast Guard Photo by Seaman Steven Storhmaier/released)
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