Amphibious tractors were used extensively in the Vietnam War, John Teasdale traces their history
An innovation successfully deployed during World War Two was the Landing Vehicle Tracked, otherwise known as the amphibian tractor or amtrac. The full-tracked vehicle – or rather vehicles, as there were several different designs – were initially acquired by the US Marine Corps for amphibious landings. During the war, the marines used amtracs extensively as they assaulted Pacific islands held by the Japanese. Amtracs were also used by the US Army and America’s allies in Europe when major rivers had to be crossed.