The Willys MB and the Ford GPW, formally the U.S. Army Truck, 1⁄4-ton, 4×4, Command Reconnaissance, informally the Willys Jeep, Jeep, or jeep and sometimes referred to by its supply catalogue designation G503, are American off-road four-wheel drive military light utility vehicles, built in large numbers to a single standardized design, for the United States and the Allies of World War II from 1941 until 1945.