It's not even that simple- the SEALs in Zero Dark Thirty were wearing a mix of a cam pattern called AOR1 and 2 (along with some items in Multicam). AOR is a pattern developed for Navy Special Warfare. At a glance, the desert pattern version looks very similar to USMC desert MARPAT- the differences are too small to replicate on a miniature.
When I painted desert MARPAT on my 20mm Helmand Marines a few years ago I went with a suitable base colour (a Vallejo Tan or Iraqi Sand or similar I can't remember), painted all of their kit in Coyote Tan, did boots, weapons etc and then hit the miniatures with painted on Medium Tone Army Painter Dip.
The Dip creates stains on the uniform areas which for me looks close enough to the MARPAT pattern. The real MARPAT pattern is hard to discern once its a little faded and/or is covered in dust (I have a set here and the pattern disappears at any sort of distance).
Anyway, worked for me- fast and looks good.