Sean, I really like this shot and the way your lighting amplified the "intensity" in the face. If your interested in going further with this theme/technique, I have a couple of suggestions:

1. IMHO the beanie conveys more of a gangster message than a military one. Try and get your hands on a military ball cap with the same digital camo. I think it would add to the shot considerably.

2. I actually like what you did with the back ground, but if your looking for more blending with the subject, you may try a piece of digital camo netting normally available at your local military surplus or even a piece of realtree camo netting available at your local sporting goods store---both are fairly inexpensive for a 6x6 sample.

Regardless--cool shot.