The Gama Goat was a six-wheel-drive semi-amphibious off-road vehicle originally developed for use by the US Military for the war in Vietnam. It was famous for an articulated body, which allowed it to travel over exceptionally rough terrain and for a unique four wheel steering arrangement with the front and rear wheels turning in opposite directions.
The vehicle's nickname came from two sources; "Gama" from the name of the inventor of its powered articulated joint, Roger Gamount, and "Goat" for its mountain goat-like off-road ability. Its military designation was M561, 6x6 tactical 1.5-ton truck. There was also an ambulance version known as the M792.