From what I can tell from a friend who is over there in the 101st (infantry): portable DVD player, DVDs, reading material--books, magazines, anything, GPS, digital camera with plenty of memory cards, maybe a laptop computer. In cooler months a camp stove would be useful for brewing coffee or making tea/hot chocolate. For food they can buy some stuff at local PXs but things like jerky or canned oysters seem to be desired and not available locally.
A lot will depend on where they are stationed, what sorts of barracks and base they have etc. I expect he won't actually get in-country until late Spring or early Summer, so facilies should be quite a bit better by then. Some combat troops have decent barracks with AC, refigerators, generators, snack bar, computer room, etc.
GunLvr