Army ranking question- Please respond?

[bigK]

I am thinking of going back to school for my masters in occupational therapy. I would love to be an occupational therapist and really help others live the best lives possible. I would also like to serve my country while doing so. What can be better than helping people live better lives, especially those who are serving our country. Anyway, I am wondering what the ranking of a registered occupational therapist would be in the Army. I would be a part of the Medical Specialist Corps, but do not know if this an officer position. Can someone tell me about ranking, salary, and any possible student loan repayment that may be available to me for this position in the army??? Thanks alot