I've painted my truck with Behr 100% latex solid deck stain. Ponderosa green is a near match for military 383 CARC Green. Home Depot can match any color if you bring in a paint chip of what color green you want. They scan the chip with a computer optic and get a print out on how to reproduce it. The deck stain works well and is cheap ($25 gal).
I know some guys in the local military truck club who paint their trucks this way, that's how I got 'informed' about it. I've also used the Aervoe military paints. The Behr deck stain is just as good, alittle cheaper, and easier to get. Holds up well and is fade resistant. My truck is a mud and forest truck, so it gets alot of 'bush time'.