I mixed some brown with the sand and got a color close to what you just posted Wurger. It may be a shade or two brighter but it's no longer sand and definitely darker. As far as green the many different images of P-40 flying tigers I see look to have all different shades of green. some of more of a drab color then others.
Here are all the colors of green that I have.
Green Drab - 1787
Imp Jap Army Green - 2114
Imp Jap Army Navy green - 2116
Medium green - 1713
Olive drab - 1711
Dark Drab - 2026
Out of these green colors, which mix do you think would be around the color I am looking for in the green camo?
I know it's a bit of a complicated mass of colors I gave you, I was just wondering if you could think of a combo out of these.