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 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, built in large numbers to a single standardized design, for the United States and the Allied forces in World War II from 1941 until 1945.