a) you might have some personal liability if ROTC paid for you and you do not uphold your side of the contract. Make sure you know what, if any, liability you are facing.
b) you should be investigating the Army's INTERNAL conscientious objector policy as well as staffing options insofar as you are able to influence them. For example, there may be roles inside the Army you could fulfill like nurse's assistant, chaplain's assistant, human resources analyst or something like that. I'm sure there are many internal roles that I certainly don't know of but which do not contribute to destruction.
c) look at options where you can work "from the inside". Think of roles you could do where you could learn some internal operations first hand that the liberty movement needs to be aware of. I.e. bite your tongue for X years, get the details and write about them later for educational purposes.