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The ship transported an advance party of one officer and 86 men of Company "B", 5th Special Naval Construction Battalion, from Dutch Harbor to Adak sailing on 21 July. The 8th Naval Construction Battalion, after completing work in the Aleutian Islands begun in July 1942, returned from Dutch Harbor aboard "Mormachawk", leaving Dutch Harbor 8 Aug 1943 and arriving in Seattle, Washington on the 13th.