I believe Army has a program that will pay your loans up to $40,000 per year for a maximum of three years. But my understanding is that if you take this offer, you will not be eligible for multi-year retention bonus. Also, I am not sure if you can sign up for just two years. Your best source will be your local recruiter. As far as going to Korea, it depends on whether there is a spot for endodontist when you want to go. When I was stationed in Korea few years ago, there was only one spot. If you really want to go to Korea, maybe consider joining as a general dentist since you have higher chance of getting Korea.