IIRc I used Vallejo's 'Intermediate green'. Works for me.
For completeness sake, for the Central Europe pattern camouflage uniform I use the following. Stone Grey, German Camouflage Brown, Mid Olive and Grey Black. The second is from their Panzer Aces range but similar tones exist in their normal ranges. For the web gear on the helmeted versions I've used a mix, as that seems to reflect current service practice but I've found that 'French Tanker' from the PzAces scheme works well for the pouches and vest. I just highlight witha mix of this and a tiny bit of white or buff and then dip the figures. Looks remarkably good.