The ubiquitous jeep is perhaps the most all-round vehicle ever constructed. Because it has ruggedly built and thus able to traverse most types of terrain without suffering structural damage, one of the task assigned to the jeep was that of ambulance service. The Willys MB and the Ford GPW, both formally called the U.S. Army Truck, 1⁄4-ton, 4×4, Command Reconnaissance, commonly known as Jeep and sometimes referred to as G503, were highly successful off-road capable, light, military utility vehicles, built in large numbers to a standardized design, from 1941 to 1945, for the Allied forces in World War II.
The jeep became the primary light wheeled transport vehicle of the United States Military and its Allies in World War II, as well as the postwar period. It was also the world's first mass-produced four-wheel drive car, manufactured in six-figure numbers. About 650,000 units were built, constituting a quarter of the total U.S. non-combat motor vehicles produced during the war and almost two-thirds of the 988,000 light vehicle class produced, together with the Dodge WC series. Large numbers of jeeps were provided to the U.S. allies and some 50,000 jeeps were provided to Russia during WWII - more than Nazi Germany's combined total production of their Volkswagen vehicles, the Kubelwagen and the Schwimmwagen.