This is a list of military light utility vehicles, of the kind commonly referred to as jeeps, and typically classified as 1⁄4-ton payload rated, manufactured by U.S. automakers, in order of first creation.
1941 Willys T13/T14 'Super Jeep' – MB stretched to 6x6 and armed with a 37 mm gun motor carriage. Although cancelled in favor of the M6 gun motor carriage, the T14 was developed into the MT-TUG cargo/prime mover.
1941–1944 Willys MT "Super Jeep" — 6x6, 3⁄4-ton prototype — a small number were built in various configurations.[1] Although performance was excellent, the MT was deemed "surplus to requirements" and cancelled in favor of existing 3⁄4-ton and 1 1⁄2-ton trucks.
1952–1957 M38A1C fitted with 105/106mm anti-tank recoilless rifle
M170 Ambulance
1953 Willys BC Bobcat aka "Aero Jeep" — Prototype for a very small, lightweight (1475 lbs) jeep, for easier lifting by contemporaneous helicopters,[3] eventually rejected in favor of AMC's M422 design.
Jeep-related vehicles unlike the jeep vehicle-concept
The U.S. has also used military vehicles that are directly related to jeeps, or were Willys / Jeep branded, but that digress significantly from the jeep vehicle-concept:
The amphibious jeep (WW II)
1942–1943 Ford GPA – an amphibious hulled vehicle, similar to the DUKW, but mechanically a Ford GPW jeep
1958-1960 Willys XM443 / M443E1 "Super Mule" – prototypes for 3⁄4-ton, underfloor mid-engined platform-trucks, comparable to but larger than the M274 "Mechanical Mule".[4][1][5] Never entered production due to reliability problems.