The Willys MB and the Ford GPW, both formally called the U.S. Army Truck, ton, 4×4, Command Reconnaissance, commonly known as the Willys Jeep, Jeep, or jeep, and sometimes referred to by its supply catalogue designation G503, were highly successful American off-road capable, light military utility vehicles. Over 600,000 were built to a single standardized design, for the United States and the Allied forces in World War II, from 1941 until 1945. This also made it (by its light weight) the world's first mass-produced four-wheel drive car, made in 6-figure numbers.After the first four-wheel drive 1ton and 3ton trucks, built in 5-figure numbers: the World War One American FWD Model B and Jeffery / Nash Quad, and the WW II German "Einheits-PKW der Wehrmacht"' (Standardized motor-cars for the Wehrmacht (the Nazi military)) program, produced low 5-figure numbers of 4x4 passenger cars of weights similar to the U.S. Dodges.
The -ton jeep became the primary light, wheeled, multi-role vehicle of the United States military and its allies, with President Eisenhower once calling it "one of three decisive weapons the U.S. had during WWII." With some 640,000 units built, the ton jeeps constituted a quarter of the total military support motor vehicles that the U.S. produced during the war, and almost two-thirds of the 988,000 light 4WD vehicles produced, when counted together with the Dodge WC series. Large numbers of jeeps were provided to U.S. allies, including the Soviet Union at the time. Aside from large amounts of 1- and 2ton trucks, and 25,000 ton Dodges – some 50,000 ton jeeps were shipped to help Russia during WWII – against Nazi-Germany's total production of just over 50,000 Kübelwagens, the jeep's primary counterpart.
Historian Charles K. Hyde wrote: "In many respects, the jeep became the iconic vehicle of World War II, with an almost mythological reputation of toughness, durability, and versatility.