Not sure what paint system he uses, but Martin Senour also known as Sherwin Williams has formula numbers for camo military colors. He might be able to cross these formulas over to whatever brand he uses. If not let me know and I can do some more research.
Olive: 47090
Light Olive: 47092
Juniper: 47091
Those are all dark camo greens of varying shades. I'll take a cell pic and post it here too.
EDIT: Sorry the cell pic is terrible no matter what I do...lol. I guess just let me know if he can cross those over. Olive is the closest to what people picture as "Army Green" but Juniper is pretty close to that too...Light Olive is more of a yellowish green but still dark...not light by any means.