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The M939 is a 5-ton 6×6 U.S. military heavy truck. The basic cargo versions were designed to transport a 10,000 pounds (4,500 kg) cargo load over all terrain in all weather. Designed in the late 1970s to replace the M39 and M809 series of trucks, it has been in service ever since.
M54 (M39 series) M813 (M809 series) M923 (M939 series) The 5‑ton 6x6 truck, officially "Truck, 5-ton, 6x6", was a class of heavy-duty six-wheel drive trucks used by the US Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg) load over all roads and cross-country terrain in all weather.
In 1950 the next generation of tactical trucks were being developed. Sizes were rationalized, with 1 ⁄ 4 and 3 ⁄ 4-ton 4x4s and 2 + 1 ⁄ 2, 5, and 10-ton 6x6s. Trucks were military standard designs, 6x6 trucks used common cabs and similar fender and hood styles. [14]
US Military Wheeled Vehicles (3 ed.). Victory WWII. ISBN 0-970056-71-0. Doyle, David (2003). Standard catalog of U.S. Military Vehicles. Krause. ISBN 0-87349-508-X. Archived from the original on 15 January 2018; Standard Military Vehicle Data Sheets. Ordnance Tank Automotive Cmd. 1959.
The Family of Medium Tactical Vehicles (FMTV) are a series of military vehicles based upon a common chassis, varying by payload and mission requirements. The FMTV is derived from the Austrian Steyr 12M18 truck, but substantially modified to meet United States Army requirements. These include a minimum 50 percent U.S. content. [3] [4]
The M39 series 5-ton 6×6 truck was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather.
Unlike most US trucks they had diesel engines, making them valuable for long-distance trips. Over 15,000 were built between 1940 and 1944, the most of any series. [20] [21] After the war, several Mack military trucks were purchased as surplus by European owners.
The Heavy Expanded Mobility Tactical Truck (HEMTT) is an eight-wheel drive, diesel-powered, 10-short-ton (9,100 kg) tactical truck. [2] The M977 HEMTT first entered service in 1982 with the United States Army as a replacement for the M520 Goer, and since that date has remained in production for the U.S. Army and other nations.