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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. The first DD Shermans produced by the British were used by both British and US units. Later production was by both the US and the UK. British Shermans were Sherman III (M4A2) and Sherman V (M4A4) conversions. The US used the M4A1 only for their conversions.