Regular PCS, just make sure you turn in ta-50 when you clear post. Your OCIE should be cleared. Take all the leave you can before R-Day, you won't need to worry about leave balance once you get here.
If you find USMA is not for you, they can send you back to your old unit or you can spend a few years here working on post. You do not want that on your ERB. The staff wants to work with you to ensure you will graduate. You do need to have a certain amount of time remaining in service to attend...