The Great Lakes Floating Maritime Museum is located in Duluth, Minnesota. Duluth is a Port City in the US state of Minnesota and the County seat of St The historic vessels USCG Buoy Tender Sundew, US Army Corps of Engineers tugboat Lake Superior, and the lake freighter SS William A. Irvin are moored there, and open for tours. The United States Army is a military organization whose primary mission is to "provide necessary forces and capabilities. The United States Army Corps of Engineers ( USACE) is a federal agency and a major Army command made up of some 34600 Civilian and 650 Military personnel TUGboat (ISSN 0896-3207 is a journal published three times per year by the TeX Users Group. Lake freighters, or Lakers, are Cargo vessels that ply the Great Lakes.