May 15th, 2015.
Other then the peculiar chromium yellow-green primer they used on the aluminum bodies, the trucks were painted the same USMC green as all other Marine wheeled vehicles, yellow lettering on hood sides and tailgates, unit insignias and numbers painted on the front quarter panels by the unit to whom the trucks were issued. At the time it was a semi-gloss finish, and almost every mighty mite seemed to have the snorkels factory installed.
If they had kept the vehicles longer, they likely would have ended up in the dead flat Marine green with black lettering that my 1961 was painted in after I got it from Phil Nelson in Columbiana, OH in 1977.
Some genius in DRMO had the lower bodies and wheel centers painted US Postal Service blue to try to unload them to the civilians after the deal to sell them to the Shah of Iran fell through in 1975-6. The Shah would have had his hands full as the mites did not seem to like anything less then 75+% humidity to run in, and the civilians generally had no clue what they were and didn't bite. I doubt if there are more then 150 to 200 surviving M422's and M422-A1's stateside today on a guess out of about the original 6000 built for the Corps back in the day.....
How many are still running is anyone's guess, but the 5/8" OD front hub center bolts were the weakness in the original design, but you could watch the skeletonized front wheels flex on potholes and off road work, very interesting engineering theories were embodied in these trucks, the prototype used a Porsche engine.... Which didn't fly with Army Ordnance Corps....