The LVT 4 Water Buffalo was an amphibious warfare vehicle and amphibious landing craft introduced by the United States Navy and United States Marine Corps. Designed in 1943 and based on the earlier LVT 2, it was the first to feature a rear ramp for unloading personnel and cargo, and it was the most produced LVT in any war. The M56 Scorpion was an American unarmored, airmobile self-propelled tank destroyer armed with a 90mm M54 gun with a simple blast shield and an unprotected crew compartment; it was manufactured from 1953 to 1959 by the Cadillac Motor Car Division of General Motors. The Dodge M43 was the ambulance version of the M37 cargo truck, built on almost the same chassis, and this ambulance saw action worldwide beside its M37 counterpart; Dodge produced the M43 ambulance from 1951 to July 1954, with a few delivered after that date.