After the Vietnam War the U.S. Army underwent a modernization program, which included finding an all-terrain replacement for its tactical vehicles—from the ¼-ton M151 Mutt through the 1½-ton M561 Gama Goat—with the added capacity to carry the new TOW anti-tank missile. AM General, Chrysler Defense and Teledyne Continental all submitted prototypes, and in late 1982 the Army selected AM General’s design for production as the M998 high-mobility multipurpose wheeled vehicle, or HMMWV (universally referred to by service members as the Humvee). Production kicked off in April 1984 at AM General’s plant in Mishawaka, Ind., and the first Humvees entered service in October 1985. To offset their relative high cost ($20,410 for the basic vehicle to $28,382 for the weapons carrier), the Army relied on beefed-up Chevrolet Blazers as M1008/9 CUCVs (commercial utility cargo vehicles) in logistics and support roles for which the Humvee’s off-road abilities were not needed. Both vehicles used the same General Motors 6.2-liter V8 diesel engine.