First of all, please be aware of throwing around terms - officers do not "enlist." Through the HPSP, you are undergoing direct commissioning. When you sign on that fear-inducing black line and take your oath with the recruiter, you become an officer in the United States Military.
Second, I went to Air Force COT this summer before my first year of dental school. I received no weapons training, no combat training, and spent 2 nights in an air conditioned tent on a deployment exercise - during which we were forced to return to the tents each time the temperature surpassed 90 degrees. When I graduate from dental school, I will dust off my uniform, put it on, and start practicing dentistry. There will be no extra military-style training. Sounds like a really effective combatant, huh? With the military, there is always the descrete possibility of ANYTHING. This much is true, but by the time they would be lining dentists up on the front lines, they would also be drafting every other fit person from the free world to fight too. They are spending at least $300,000 dollars on me over these four years. Why would they throw that training away so they could hand me a gun.
I continue to be baffled by the negative posts by people who know NOTHING about the military. Is it that you have to have a comment and have to be right? Also, why would you discourage others from doing something outside the private sector? It means they won't be competing for your patients. Or are you now starting to realize that a dentist who went to a great school (because they were not afraid of the debt), attended a world-class military AEGD, learned discipline and respect might be a great commodity to the dental profession? Does that scare you that you missed out? If you know any real information rather than hearsay, please share, but since you are saying that dentists sign an enlistment contract, I would guess that you have no idea what you are talking about.