What are the colors in the Desert Camo BDUs the US has?

What brand of paint are you working with? There are plenty of pics of US troops in their DCUs on the internet since 9/11. Just run a quick web image search.

If you like Humbrol paints (my personal 1st choice for figure colors hand brushing) use pale stone 121, Dark stone 187, and light earth 119, for reasonable matches. 

DCUs are in a three-color pattern.  It is basically an overall sand, large sploches of a khaki-green color, and dark brown shadows.

I use Testors Model Master enamel paints and use Sand, a home-mixed khaki-green (SAC Bomber Tan is good too), and leather brown.