The Gamma Goat is one of the less-succesful American military vehicles. Designed as an all-terrain amphibious light cargo truck, it ended up being extremely noisy, not very seaworthy, and hugely expensive. Their only serious use, as far as I can gather, was the U.S. invasion of Granada. They do seem to be quite popular on the military vehicle collector's circuit now. Thos one was on display at a farm machinery museum in France.