I used this scheme for Seven Days to the River Rhine.

Vehicles

1. Brown NATO Brown
2. Green NATO Green
3. Black NATO Black

Apache & AH1-Cobra

1. Green US Army Helo Drab FS 34031

A10

1. Medium Green Green FS 34102
2. Gunship Green Dull Dark Green FS 34092
3. Grey Grey FS 36081

Infantry

1. Tan Khaki
2. Brown NATO Brown
3. Black NATO Black
4. Green NATO Green