DD tank
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DD or duplex drive tanks, nicknamed "Donald Duck tanks", were a type of amphibious swimming tank developed by the British during the Second World War. The phrase is mostly used for the Duplex Drive variant of the M4 Sherman medium tank, that was used by the Western Allies during and after the Normandy Landings in June 1944.
DD Sherman tank with its flotation screen lowered.
Valentine DD tank with screen lowered and gun pointing towards the rear of the vehicle
A Valentine DD tank being loaded onto a landing craft prior to a training exercise, Stokes Bay, Hampshire, January 1944
Rear view of a Sherman DD with its screen raised, showing the twin propellers in their lowered position
Amphibious vehicle
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An amphibious vehicle is a vehicle that is a means of transport viable on land as well as on or under water. Amphibious vehicles include amphibious bicycles, ATVs, cars, buses, trucks, railway vehicles, combat vehicles and hovercraft.
Pod Water Jet on a French VAB
A conestoga wagon
Amphibious steam-powered carriage designed by Oliver Evans (1775–1819)
Alligator tug Bonnechere, 1907