I want to reemphasize what the other guys are saying...
NO STIMS!
Also, you need something that won't go bad in hot weather or being left out in the sun.
Multi, BCAAs, Protein, DCP, Poseidon, I'd recommend Sesamin, but it'd go bad in the heat.
Also, consider stocking up on crystal light individual packets. You're going to have to drink alot of water over there, ESPECIALLY if you're taking supps and working out. You may need something to make the water go down easier or at least make it enjoyable. Sugarfree gum may be a good idea as well.
Honestly, you probably don't need anything. If you work our 3 times a week, wear your battle rattle, and stay active, you will probably lose 60 pounds over there. You have a freaking year with nothing better to do.