Choosing a color for the troops

So I'm getting ready to paint my figures for the US Infantry during the Pershing Expedition. I can't quite decide on the color to use. Looking for some thoughts. Here's a shot of the figures painted with one coat of the colors of choice.

the paints are Vallejo 70.880 Khaki Grey, 70.913 Yellow Ochre, 70.879 Green Brown.

Some ideas came from here Wild Bunch For Dummies. I guess I'm leaning towards the Khaki Grey.

Finaly something finished

Well I've just finish my first unit a cavalry.

It was a little cold for spraying but I just had to get these done. In the photos I picked up the inconsistancy of the paint on the side of the base I'll need to fix that when the weather warms up. Also this guy was finished

I was able to start basing the 15mm figures and hope to have them finished by tomorrow.

Next up are these two units. It's too cold to spray prime so they'll get a coat of gesso.