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THULE AIR BASE, Greenland (April 14, 2021) Steelworker Constructionman Alejandro Calderon, assigned to Naval Mobile Construction Battalion (NMCB) 1, welds a metal table to be used for underwater welding training in support of the testing and evaluation of Naval Construction Force (NCF) equipment in an arctic environment. Underwater Construction Team (UTC) 1 and Naval Construction Battalion 1 are completing arctic exercise missions at Thule Air Base in Greenland. (U.S. Navy photo by Builder 3rd Class Emily Due)
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