The US Army only uses one digital pattern uniform, called the Army Combat Uniform (ACU). The colors are a medium sand color as a base, with pixels of a gray-green color, and then a light-medium green pixels on top of that. Sorry, but I have no idea what Tamiya colors would be close, I don't use Tamiya paints.
Check this article at Armorama for a tutorial on painting it.
As a note, no idea where he got the pic of the long-haired dude wearing the ACU, but he should have tan-colored desert boots on, not black boots.
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
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"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell