You mean the Truck, Utility, 1/4 Ton, M---. When I first went in was the M38A1, by 1968 it was the M151 - made by Ford and subject to rolling over at the worst possible moment. You might use a "jeep" in the US military, but after that you took a "3/4" (refers to tonnage) or a "five quarter" (M715, 1.25 tons). For heavier loads there were "deuce and halfs" which were can "six bys" or "six by sixes" by the Marines (referring to six wheels getting drive traction) or "five tons" or "draggin' wagons" (10 tons).