USS Mackinac (1917)
USRC Mackinac, later USCGC Mackinac, was a patrol boat that served in the United States Revenue Cutter Service from 1903 to 1915 and in the United States Coast Guard from 1915 to 1917 and from 1919 to 1939.
Read more about USS Mackinac (1917): Construction and Commissioning, Operations On The Great Lakes and Massachusetts Coast 1903-1917, United States Navy Service 1917-1919, Coast Guard Career 1919-1939, Decommissioning
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... Mackinac was decommissioned on 8 June 1939. ...