AFAIK the US Army started introducing the MASSTER 4-colour camouflage in the early 70's (1972? 1973?). At the top of my stash of kits to build are, among others: M41 Walker Bulldog and 2 APCs - the tiny M114 and the mammoth M59. I already have documentation for the M114 in the MASSTER camouflage (thanks to Takom), the M41 went out of use in the US Army probably in 1969, so it's too old, but what about the M59? They served in garrisons in Germany supposedly until 1979. Has anyone seen any photos of the M59 in four-color MASSTER camouflage?
Interestingly, there are photos of the M59 (unfortunately usually as the M84 mortar carrier) on the web in an even later MERDC camouflage, although - for me - they bear the hallmarks of the painter's improvisation. Each example has a different pattern, and IIRC the Army developed a separate template for each type of vehicle that had to be adhered to.
Cheers
Michael