M561s

The M561, commonly known as the Gama Goat, is a six-wheel-drive, articulated, amphibious cargo truck developed by the United States Army. Its distinctive articulated design allows it to traverse extremely rough terrain and cross bodies of water. The M561 was designed to replace older, less capable tactical trucks and to provide a highly mobile supply vehicle for forward deployed troops.

The vehicle consists of two main sections: a front cab unit and a rear cargo unit. These sections are connected by a pivoting joint, allowing for significant articulation. This articulation is crucial for its off-road capabilities, enabling each section to maintain contact with the ground even when traversing uneven surfaces. The M561 is powered by a diesel engine and can achieve a top speed of approximately 55 miles per hour on roads. Its amphibious capability allows it to propel itself through water using its wheels.

Production of the M561 began in the late 1960s, and it saw extensive service with the US Army and Marine Corps, particularly during the Vietnam War. While effective in its intended roles, the Gama Goat was also known for its complexity and maintenance requirements. Over time, it was gradually phased out of service, replaced by more modern and less maintenance-intensive tactical vehicles. Despite its eventual retirement from frontline service, the M561 remains an iconic vehicle in military logistics history, recognized for its unique design and impressive off-road performance.