The Gama Goat was a six-wheel-drive semi-amphibious off-road vehicle originally developed for use by the US Military in the Vietnam War. It was famous for an articulated two body system, which allowed it to travel over exceptionally rough, often muddy terrain 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, 6×6 tactical 1-1/4-ton truck. There was also an ambulance version known as the M792 that could carry four litters. The Gama Goat was 226.6 inch (5.76 m) long; had a curb weight of 7,300 pounds (3,300 kg); had a payload capacity of 2,900 pounds (1,300 kg); and was powered by a Detroit Diesel 3-53 three cylinder, two-stroke engine that produced 101 hp (77 kW) at 2,800 rpm with a 159.3 in³ (2,610 cc) displacement. It could travel at 55 mph (90 km/h) on paved surfaces and traverse almost any terrain. A simple exhaust baffle was used instead of a muffler, so they could easily be heard before seen. It was designed to be air-transportable and droppable by parachute.This is my own design. The model is 635mm long x 230mm wide and 220mm High and weighs 8.5kg.