Well put cpxxx. Although I have found that:
a: olive drab is dependant on who mixed and where.... I believe there are like 50 or 60 shades of the stuff, then leave it in the sun for awhile, and whammo, it is different again!
b: each squad had different color preferences, as in tones, and it changed REGULARLY
c: No one ever wrote down crap when it came to how they painted. Except factories, but that changed everytime a new batch of paint arrived.
So color is a *****, but placement, that is completely different. That was standardised at the factory.