My brother is there with the USAF...
...and I am a carpenter. I have been looking at doing the same, and my brother is very highly encouraging of the idea. Lot's of money out there to be made for those of us who ain't scared of the hard work, scorching heat and a couple of little roadside bombs, eh?
That being said - I'd take my Sig Pro, or get one of the compact P-models (225, 228, 229, etc.) I like my other weapons, but don't know that I would want to go into a warzone with any less than Sig reliability / accuracy. If a P226 fits you, I'd also seriously consider one of those.