You will get the money back. The tuition payments from the Army cover the ENTIRE tuition, and you will have a credit on your account. You will need to inquire about the overage w/ the admissions/student affairs office, however, in order to work out getting a check sent to you.
I asked my recruiter about this a couple of months ago, and he's been straight up with me from the start so I believe him. Wouldn't really know where to find the answer otherwise.