I was in the USMC from 1956 to 1959. The type of Poncho in use at that time had green camo on one side and brown on the other. They were fairly stiff, even at that time. They were carried folded over the back of the cartridge belt. I do not believe they had any markings. At least none that I recall. I also have one currently that I picked up somewhere over the years. That one is very stiff and contains no markings. I might add that the M.C. rarely got any new equipment and in the mid 1950's all of our 782 gear was mostly WW2 and Korean war vintage.