The patterns and colors shown are not the NATO standard 3-color pattern. They are the old 7th Army 4 color MERDC schemes that were accepted for use by the entire army in the mid 1970s through 1980s. Note that the types of paints directed for use are not the Chemical Agent Resistant Coating (CARC) paints.
Maybe after seeing the instructions and pictures of soldiers painting actual vehicles, so many modelers won’t be painting their post-Vietnam era armor in such pristine patterns.

The manual is posted here: TC 5-200