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Chattanooga Ducks are called "ducks" and are still in use today. There are also specially constructed amphibious tourist buses, which are mainly used as tourist transportation in ports and river cities. DUKW (now called "Duck") was developed by the National Defense Research Council and the Office of Scientific Research and Development. It was initially rejected by the military. When a US Coast Guard patrol boat ran aground in a sandbar near Provincetown, Massachusetts, an experimental Chattanooga Ducks happened to demonstrate in the area. Wind speeds of up to 60 knots (110 km/h), heavy rain and heavy waves prevented traditional ships from rescuing seven stranded Coast Guard members, but DUKW did not encounter any trouble and the military's opposition subsided. DUKW later crossed the English Channel and proved its seaworthiness.