Can't go college ROTC until enrolling in college. And ROTC does not count toward the 9.9 rides.
I'm not completely up to date on ROTC, but IIRC there are 2-yr, 3-yr, and 4-yr scholarships. The 4-yr one is awarded nationally, the others are awarded locally. All of them are 100% paid tuition, books, and fees, plus a stipend that's probably around $500/month now -- regardless of which branch (Army, Navy, or Air Force). So a ROTC wrestler would have to pay for 1, 2, or 3 out of 5 years.
I think there are partial ROTC scholarships available -- no idea what the military commitment would be for those, or whether those would be attractive to a Manville.