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M561 (Gamma Goat)


6x6 Tactical 1.25-ton Truck


United States | 1969



"Nearly 15,300 M561 Gamma Goats were produced for the United States military during the 1960s."



Authored By: Staff Writer | Last Edited: 09/28/2016 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
Observing the active French Army involvement in Southeast Asia, the US military began to research a new logistically-minded cargo-hauling vehicle to pair with its new Ford-built M151 MUTT (replacing the post-World War 2/Korean War-era Willys M38 series jeeps). A formal contract offering was announced and, to this, there proved responses from several sources though it ultimately settled to Ling-Temco-Vought (LTV) as the primary designer. LTV unveiled a six-wheeled, 6x6 powered vehicle designed around a primary four-wheeled section attached (by an articulated joint) to a two-wheeled trailer. Despite the joint separating the two sections, the front-most and rear-most axles worked in conjunction, turning in opposite directions to achieve the required turn radius. Pilot vehicles were powered by an air-cooled engine though, after evaluation, this was given up in favor of a Detroit Diesel 3-53 3-cylinder, 2-stroke diesel-fueled engine of 103 horsepower. Overall, the vehicle weighed 7,000lbs, featured a 15-inch ground clearance and could make headway on paved surfaces at 55 miles per hour. Additionally, the vehicle held excellent cross-country performance thanks to its 6x6 powered drive with articulated joint unit and was given an inherent (though limited) amphibious capability.

The "Gamma Goat" - earning its name from designer of the articulated joint, Roger Gamount, coupled with the excellent climbing qualities of a wild goat - entered the US Army inventory in 1969 with deliveries ending in 1973 (under the formal designation of "M561, 6x6, Tactical, 1-1/4ton Truck"). A medical-minded transport variant, the M792, was also developed in time. Production was charged to CONsolidated Diesel Electric Company (CONDEC) of North Carolina.

The M561 proved its worth as a carrier though the design was not without issue. The diesel engine lacked a muffler and its position behind the driver posed problems with the noise being generated. The vehicle operated at such loud levels that ear protection became standard for its drivers. This also led to the vehicle proving something of a tactical liability near an active battlefront - particularly if used as a personnel carrier. The system was generally slow when teamed with fast-moving wheeled convoys and its amphibious capability became something of a moot quality - the Gamma Goat required a rather still body of water to traverse and this at a top speed of just 2.5 miles per hour (movement managed solely by the action of its spinning wheels). Mechanics were not fond of the vehicle's heard-to-reach sections which added to maintenance turnaround times and steering the 6x6 machine, while excellent when going off-road, proved something of a challenge to the inexperienced when on stable, flat finished roads.

Gamma Goats were produced to the tune of 15,274 examples before their manufacture run had ended. They served in the US Army inventory throughout the remainder of the Vietnam War before they were given up for good with the arrival of cheaper utility trucks and the ubiquitous HUMVEE multirole vehicle. Over its service life, the Gamma Goat was modified from its base personnel / cargo hauler form into specialized mortar, artillery spotting, radar, ambulance and communications vehicles. The M561 only entered into foreign service with the Mexican Army and Navy.

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Power & Performance
Those special qualities that separate one land system design from another. Performance specifications presented assume optimal operating conditions for the M561 (Gamma Goat) 6x6 Tactical 1.25-ton Truck.
1 x Detroit Diesel 3-53 3-cylinder, 2-stroke diesel-fueled engine developing 101 horsepower @ 2,800rpm.
Installed Power
56 mph
90 kph
Road Speed
Structure
The physical qualities of the M561 (Gamma Goat) 6x6 Tactical 1.25-ton Truck.
1
(MANNED)
Crew
18.9 ft
5.76 meters
O/A Length
7,275 lb
3,300 kg | 3.6 tons
Weight
Armament & Ammunition
Available supported armament, ammunition, and special-mission equipment featured in the design of the M561 (Gamma Goat) 6x6 Tactical 1.25-ton Truck.
Usually none. Personal weapons carrier by the crew. Mortar carrier mounts field mortar.
AMMUNITION:
Dependent upon weapons carried.
SPECIAL EQUIPMENT:
Nightvision - NONE
Chemical, Biological, Radiological, Nuclear Protection (CBRN) - NONE
Variants
Notable series variants as part of the M561 (Gamma Goat) family line.
M561 - Base Cargo Carrier; subvariants of mortar carrier, communications vehicle, artillery director and mobile radar vehicle.
M792 - Ambulance variant; provisions for four medical litters.
Operators
Global customers who have evaluated and/or operated the M561 (Gamma Goat). Nations are displayed by flag, each linked to their respective national land systems listing.

Total Production: 15,274 Units

Contractor(s): Ling-Temco-Vought (LTV) - USA
National flag of Mexico National flag of the United States

[ Mexico; United States ]
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Design Qualities
Some designs are single-minded in their approach while others offer a more versatile solution to battlefield requirements.
AMPHIBIOUS ASSAULT
UTILITY
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The M561 (Gamma Goat) 6x6 Tactical 1.25-ton Truck appears in the following collections:
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