In 1979, AM General started preliminary design work on the M998 Series High Mobility Multi-Purpose Wheel Vehicle (HMMWV, pronounced Humvee), a 1.25 ton truck to replace the M151 Mutt and other light tactical vehicles. U.S. Army awarded AM General a prototype contract in 1981 and the development and tuning was carried out over a period of five months in 1982. In March 1983, AM General won an initial contract for $ 1,200,000,000 to produce 55,000 Humvees to be delivered in five basic models and 15 different configurations over a period of five years.
Driving the Humvees feature full-time four-wheel independent suspension, and the angles of steep approach output gradeability 60 percent and 16 inches above the ground. Humvees are currently in use by the U.S. Army, Marines, Air Force and Navy in the places in the United States and in over 50 foreign nations environment. Current production models include the M1151, M1152, M1165 and M1167.