The DUKW (colloquially known as Duck) is a six-wheel-drive modification of the 2-ton capacity "deuce" trucks used by the U.S. military in World War II amphibious truck, designed by a partnership under military auspices of Sparkman & Stephens and General Motors Corporation (GMC) for transporting goods and troops over land and water, and approaching and crossing beaches in amphibious attacks. Designed only to last long enough to meet the demands of combat, DUKWs were later used as tourist craft in marine environments.
The DUKW was supplied to the U.S. Army, U.S. Marine Corps and Allied forces. 2,000 were supplied to Britain under the Lend-Lease program and 535 were acquired by Australian forces. 586 were supplied to the Soviet Union, which built its own version, the BAV 485, after the war.
DUKWs were initially sent to the Pacific theatre's Guadalcanal, and were used by an invasion force for the first time during the Sicilian Operation Husky in the Mediterranean. They were used on the D-Day beaches of Normandy and in the Battle of the Scheldt, Operation Veritable and Operation Plunder. Amphibious beachheads were thought to be highly vulnerable to early counterattack as the landing units would deplete their ammunition and the supply system would not yet be established. The principal use was to ferry supplies from ship to shore, and tasks such as transporting wounded combatants to hospital ships or operations in flooded (polder) landscape.