Odds are the military won't send you to Iraq straight out of dental school. Sorry, guys.
I mean, why? You'll be valuable. There are dentists in Iraq but mostly medics are doing the fieldwork. From what my recruiter has told me (yes - some recruiters can be dogs, but I trust mine), after school one can either choose an on-base residency position or start practicing at a location from your very own Top 10 List (or maybe it's Top 8). These assignments can be in the states or overseas. While not guarenteed, they'll for sure consider your preferences.
For me, military is a nice way to go because my family has a history of service, I might be able to pratice in Germany close to my family, and I won't have huge debt hanging over my head in dental school. Also, the military can promise you things that can't be guarenteed in the civilian sector. I mean, you must consider the following:
Some students may not get an associateship right out of school, some will not have the means to open a private practice, some may not even get a spot in one of those bureaucratic dental group chains.
Atleast, the military gives you a path for 4 years after dental school. You know you'll be getting paid. Heck, if I like it, I'll make a career of it, retire in 20 years, and use my military retirement to build my own dental practice from the ground up. Taking the scholarship is a lot easier than worrying about what the furture will hold...