In 1961, Japan began replacing their Chaffee light tanks with Walker Bulldogs, and were curious if they could find a continued use for the old Chaffees. With a 75mm main gun and less than 40mm of armor at its thickest, they weren't exactly a threat to newer tanks rolling off the assembly lines. Their solution was to fit a quartet of
Type 64 MAT (Paul lists it as Type 65) in individual box launchers on the turret. Each rear corner of the turret had a box, while the other two were attached to the sides of the turret.
The thinking was that even as the M24 was being replaced as a combat tank, its gun was still useful against soft or light-armored vehicles (APCs), and the ATGMs would give it a punch if it ran across something the gun couldn't handle.
At least one prototype was built and tested, but it was felt that given the relatively slow and underpowered nature of the missile, mounting it on something that couldn't hide wasn't a good use of resources. It would also be expensive to maintain compared to a jeep or APC-mounted launcher, since there wasn't parts commonality with any other vehicles.