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6×6 Cargo vehicle
M561 Gama Goat
Type
6×6 Cargo vehicle
Place of origin
United States
Service history
In service
1970s–1990s
Used by
United States and Mexico
Wars
Vietnam War
Production history
Designer
Chance-Vought Aircraft
Designed
1962–1966
Manufacturer
CONDEC
Unit cost
$13,281[1]
Produced
1969–1973
No. built
14,274
Variants
M792
Specifications
Mass
7,275 lb (3,300 kg)
Length
227 in (5.8 m)
Width
84 in (2.1 m)
Height
91 in (2.3 m)
Crew
1
Engine
Detroit Diesel 3-53 160 cu in (2.6 L) Diesel I3 101 hp (75 kW), 217 lbf⋅ft (294 N⋅m)
Suspension
Wheel 6×6
Operational range
420 mi (680 km)
Maximum speed
56 mph (90 km/h)
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. The Goat uses an articulated chassis, so that from distance it appears to be a four-wheel drive vehicle pulling a two-wheel trailer, but it is a single six-wheel vehicle with a four-wheel steering arrangement with the front and rear wheels turning in opposite directions. It was famous for its ability to travel over exceptionally rough and muddy terrain.
The vehicle's nickname came from two sources: "Gama" from the name of the inventor of its powered articulated joint, Roger Gamaunt, and "Goat" for its mountain goat-like off-road ability. Its military designation was M561, 6×6 tactical 1¼-ton truck. There was also an ambulance version known as the M792. The vehicle was replaced by a variety of Commercial Utility Cargo Vehicles and Humvees.
^Statement of Dr. J. Ronald Fox, Assistant Secretary of the Army, The Acquisition of Weapons Systems, May 21, 1970, pt. 2, p. 470.
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