The M39 Series began to be replaced by the M809 series in 1970, followed by the M939 series in 1982, but continues to serve in other nations' armed forces around the world. Marine forces during the Vietnam War, and was also used by the U.S.
The M54 was the primary heavy cargo truck of the U.S. In on-road service the load weight was doubled. It was designed to transport a 10,000 lb (4,500 kg), 14-foot-long (4.3 m) cargo load off-road in all weather. The M54 5-ton 6×6 truck (G744) was the basic cargo model of the M39 Series truck. M54 cargo truck during Exercise Reforger, 1991
