The XR311 was a prototype military vehicle of US origin that was procured in limited numbers during the 1970s. It was originally developed as the High Mobility Combat Vehicle, or HMCV.

The Truck, Utility, ¼-Ton, 4×4, or simply M151 was the successor to the Korean War M38 and M38A1 Jeep Light Utility Vehicles. The M151 had an integrated body design which offered a little more space than prior jeeps, and featured all-around independent suspension with coil springs. It has since been replaced by the larger AM General HMMWV in most utility roles in frontline use. With some M151A2 units still in U.S. military service in 1999, the M151 series achieved a longer run of service than that of the World War II/Korean War-era MB/GPW, M38, and M38A1 series combined.