Hi Matt.
First off, I also checked on some re-enactor and militaria sights, and there are several examples of D-Day U.S. Paratrooper uniforms in a light green colour. My example appears to be wearing a uniform which was particular to the 101st Airborne, so perhaps your colours are perfectly correct. In fact, I would bet on it. Having said that, here is how I went about getting the shades you see in the posts here.
I used Humbrol enamels, for most of the basic colours. To get just the right shade, I sometimes add a little artist's oils to these. For example, I used the Humbrol tan #95, with a little Burnt Sienna and Light Yellow Ochre to get the right shade. This mixture was thinned out and applies in a thin coat. You have to leave it set over night to make sure the first coat is really dry, and then I used the artist's oils alone to do the shading. Burnt Sienna and Burnt Umber with a touch of Lamp Black were used for shadows, and the Yellow Light Ochre and Titanium White for the high lights. This is just for the basic uniform colour, but the other bits were painted in the same way. It turns out a little shiny, so you'll need a good dull coat to take the sheen off.
There are alot of good sources for actual painting techniques. Bill Horan's book "Figure Painting Masterclass" is one of the best and would be well worth the price if you can get ahold of it. The best thing to do is experiment and see what works for you. Let me know if there is any thing else I can help you with, and thanks again for your feedback. I look forward to seeing some of those pictures