Fmc designed and built most of our lvts during the war based on Donald Roeblings original alligator design. The original alligator was deemed unsuitable for military use but showed promise and the marines pressed Roebling to design one for their needs. Roebling made a new design that the navy and marines accepted. FMC resisted it for manufacture the LVT 1 proved unsatisfactory in proving test and agiain redesigned LVT 2 was wider longer redesigned swimming tracks. This vehicle was it. The LVT 3 followed slightly larger. I was suprised all LVTs at this point were plain steel. The LVTA1 then2/4/5. I really wasn't impressed with the Stuart turret as the 37 always proved to be under powered and the marines complained as such, then the 4 and 5 with the M8 turret better but howitzers have always proven to not compare with direct fire weapons. So again the marines asked for a solution. The LVT A1/M24 prototype built tested and passed with recommended changes for production unfortunately the war ended before production could start. I tried to find drawings of the projected final model but could only find the first M24 prototype. Tried to contact FMC but they only have a phone number could not find a web site. I think it would have been great if they had built it. The marines used the LVT 3/4/5 in Korea and used them inland carrying supplies but again had the problem of direct fire support unless accompanied by a tank. FMC still going strong with the Bradley and Bradley based support vehicles the MRLs and the mobile command center and resupply vehicles. Of course their main business food machinery for farming. Roebling's widow donated one of his early alligators to the marines that sits in the marines museum for the history of LVTs.