The Willys MB and the Ford GPW, both formally called the U.S. Army Truck, 1/4 ton, 4x4, Command Reconnaissance, commonly known as Jeep, and sometimes referred to as G503 are light, off-road capable, military utility vehicles that were manufactured during World War II (from 1941 to 1945) to help mobilize the Allied forces.
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 — becoming the world's first mass-produced four-wheel drive car, manufactured in six-figure numbers. The approx. 640,000 units built, constituted a quarter of the total U.S. non-combat motor vehicle production in the war.