This 1971 M561 “Gama Goat” is the third featured on BaT, but one was a project and the other a heavily modified, 454 big-block Chevy powered example. Designed for us by US forces in Vietnam, these articulated, 6×6, semi-amphibious trucks had four-wheel steering, and this one retains its original, three-cylinder Detroit Diesel engine. Incredibly, it’s registered for street use, and was recently driven in a Veteran’s Day parade. Find it here on Craigslist in Magnolia, Texas for $14,900.

The seller mentions some peeling paint, but overall condition looks quite good for an old military vehicle, including twin canvas tops. The articulated bed is removable for service, and though drivable without it in place, these trucks weren’t designed to be operated with the two halves separated. Four-wheel steering involves the rearmost axle turning in the opposite direction of the front, and a clever drive system allows all six wheels to turn under power even during extreme articulation.

The term “semi-amphibious” refers to the vehicle’s very low freeboard and lack of a propeller–forward movement was designed to be provided by the six spinning wheels. The seller notes that this one will need some missing hull access plugs replaced, as well as a hole in the trailer fixed prior to being used on the water. Bilge pumps sound to be in working order, however. Power comes from a 103 horse Detroit Diesel three-cylinder, enough to allow a 55 MPH top speed on flat, paved surfaces. Curb weight is quoted as 7,300 pounds, with a 2,900 pound load capacity.

A clean title is included, and the ad notes overall condition as excellent. We’re still eagerly awaiting a brave entrepreneur to open the off-road theme park idea floated earlier this month in a Ferrari tractor story–this thing could be a star attraction.