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DUKW Amphibious 2 1/2 Ton 6x6 Truck

The concept the DUKW Amphibious 2 1/2 Ton 6x6 Truck -- a cargo truck-sized vehicle to unload ships across unprepared beaches without loss of momentum at the surf line -- was first recognized in mid-April 1942. Under the urgency of World War II, using the management of the National Defense Research Commmittee, the first DUKW was swimmiing by early June 1942. First productions models were delivered in November 1942, and DUKWs were first used in quantity in the July 1943 landing in Sicily. By December 1943, production of the DUKW had reached 1,500 per month.

A DUKW belonging to the 532nd Engineer Boat and Shore Regiment lies alongside a cargo ship in the harbor at Inch'on, Korea while a cargo net is used to transfer supplies to the DUKW for transport to the beach, 12 June 1951
A DUKW belonging to the 532nd Engineer Boat and Shore Regiment lies alongside a cargo ship in the harbor at Inch'on, Korea while a cargo net is used to transfer supplies to the DUKW for transport to the beach, 12 June 1951.

Today in WW II: 26 Jul 1941 Major Gen. Douglas MacArthur, retired US Army Chief of Staff, recalled to active duty, assigned to mobilize the Philippine Army and strengthen the US garrison in the Philippine Islands.  More 
26 Jul 1945 Allies issue the Potsdam Declaration calling for the surrender of Japan, promising 'prompt and utter destruction' if not.
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

Truck, Amphibious, 2 1/2 ton, 6x6 DUKW

The DUKW was developed quickly during World War II to meet the need for amphibious cargo transfer from ship to shore. The nomenclature DUKW was assigned by the manufacturer, General Motors Corporation, from:

D= First year of manufacture, 1942
U = Utility vehicle (amphibious)
K = All wheel drive
W = Rear tandem axle

Someone quickly noticed that DUKW could be pronounced "duck" and the "Army Duck" was born.

The DUKW was based on the GMC "deuce and a half" 2 1/2-ton 6x6 CCKW, fitted with a watertight hull and propeller. Following the war, many of the versitile DUKWs were transferred for Coast Guard duty, river patrols or later Civil Defense work. They continue in service today with popular "Duck Tours".

The DUKW was considered an extraordinary success not only for its general technical quality, but also for these reasons:

  • Timeliness -- DUKW was both available and needed
  • Training -- Considerable effort went into operational training, an effort that was still growing in mid-1945
  • Continuing development -- Improvements suggested by field experience were rapidly made, both in the field and on current production models

DUKW production did not keep up with the demand. There were never enough available to meet much more than the basic over-the-beach landing requirements. Few of the secondary uses proposed -- pontoon bridges, mobile ferries, etc. -- were ever widely tried in the field.

Despite its overall success, the DUKW was criticized from the beginning as too small for reasonable cargo volume, difficult to unload, too slow in the water, too prone to bogging in muddy conditions, and helpless in exiting from the water except over rersonably good sand beaches, These deficiencies led to post-War developments, including the XM147 Super DUKW and the LARC-V (Lighter, Amphibious, Resupply, Cargo, 5 ton capacity).

DUKW Specifications

Length31 feet
Width8.25 feet
Height8.8 feet (w/top up)
Weight7.5 tons
Engine270 cu in GMC Straight 6
Water speed6.4 mph
Road speed50 mph
Number mfg by August 194521,000 (with 6,000 more on order)
Capacity: Troops25 or 12 on litters
Capacity: Cargo5 tons

The DUKW was the first vehicle with a central tire pressure control, allowing the operator to adjust the tires for hard surface roads (high pressure) or sand (low pressure) from the driver's seat. This is now a feature of the HMMWV and other modern vehicles.

Find additional photos and hi-res versions of the DUKW Truck, Amphibious, 2 1/2 ton, 6x6 at the Olive-Drab Military Mashup:

DUKW amphibious 2 1/2-ton 6x6 trucks on the beach at Selsey Bill, on the south coast of England, prior to D-Day in 1944.  In the water, completed caissons for the Mulberry Harbor wait for their use in the invasion.
At the beachhead, Anzio, Italy, following the January 1944 landings, German shellfire falls among the DUKW amphibious trucks ferrying supplies from Liberty Ships offshore.  The fire did not stop operations, but was considered a nuisance, causing only minimal damage and casualties.
DUKW Amphibious 2 1/2 Ton 6x6 Trucks in Venice, Italy, during World War II.
Engineers of the 532nd Engineer Boat Shore Regiment, US Army use a crawler crane to transfer 155mm artillery shells from a DUKW to a waiting railroad car, Inchon, Korea, September 1950.
In preparation for the landings at Anzio, CCKW 2 1/2-ton trucks, DUKW amphibious trucks, and other vehicles loaded onto LSTs or waiting on the dock, Port of Naples, Italy, 18 January 1944.  Trucks were preloaded with supplies for specific units so they could be moved inland from the invasion beach without further handling, a novel logistical approach at the time.
Cargo transfer point on Omaha Beach, where DUKW amphibious trucks were reloaded on other trucks for transfer to supply and ammunition depots, Normandy, France, 19 July 1944.

GMC DUKW Amphibious 2 1/2-ton 6x6 Photo Gallery


DUKW landing in the Philipines
DUKW landing in the Philipines.

DUKW Landing

DUKW rear view, Hampton Roads Port of Embarkation, VA, 3 February 1943
DUKW rear view, Hampton Roads Port of Embarkation, VA, 3 February 1943.


DUKW at the Texas Military Forces Museum, Camp Mabry, TX
DUKW at the Texas Military Forces Museum, Camp Mabry, TX, 3 February 2006. Photo: Courtesy of Bob Pettit.

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