Red, I use a Khaki brown , drybrushed over dark grey primer.Then highlight it with Khaki green,fianlly a light "dust" of khaki on the high points for highlights/dirt dust. Tamiya Acrylic military colors.
Vallejo, MIght make some ww2 Soviet uniform Acrylic thats good right out of the tube. Be careful though, I used some Soviet khako green from Testors{ I think it was} and it was a definate post war uniform color.
Fub