The Willys MB and the Ford GPW, both formally called the U.S. Army Truck, ​1⁄4-ton, 4×4, Command Reconnaissance,[2][3] commonly known as the Willys Jeep, Jeep, or jeep,[4] and sometimes referred to as G503,[nb 4] were highly successful American off-road capable light military utility vehicles built in large numbers to a standardized design for the United States and other Allied forces in World War II from 1941 to 1945.