The M151 MUTT was the successor to the Korean War M38 and M38A1 jeep Light Utility Vehicles. It was produced from 1959 through 1982 and served in the Vietnam War. The M151 utilized a monocoque design making it roomier than previous jeep designs, and incorporated an independent suspension with coil springs. It has since been replaced by the larger AM General HMMWVW in most utility roles in frontline use. With some M151A2-units still in US Military service in 1999, the M151-series has achieved a longer run of service than that of the WW2 MB/GPW, M38 and M38A1 series combined.
In 1951 Ford Motor Company was awarded the contract to design a 1/4 ton 4×4 Military Utility Tactical Truck (hence MUTT) to replace the M38 and M38A1 model jeeps. The M151 'MUTT' was developed with guidance from the US Army's Ordnance Truck Automotive Command. Design started in 1951 and testing and prototyping lasted through most of the fifties. Although the M151 was developed and initially produced by Ford, production contracts for the M151A2 were later also awarded to Kaiser Jeep and AM General Corp.
First put into service in Vietnam, the MUTT played an active part in American military operations well into the 1980s, when it was phased out in favor of the Humvee. Despite its official replacement, the M151 had some distinct advantages over its much larger and heavier successor, like being small enough to fit inside a C-130 cargo plane or CH-53 heavy transport helicopter. This flexibility was one of the reasons the US Marine Corps deployed M151 FAV (Fast Attack Vehicle) variants through 1999, in places like Kosovo.
Various models of the M-151 have seen successful military service in 15 different NATO countries and M151s were sold to many countries, including Canada, Denmark, Lebanon, Israel, the Philippines the United Kingdom and non-NATO countries like Pakistan. Currently, the M151 is used by over 100 countries worldwide.