Biggest mistake in my life was listening to my parents (both prior service) who insisted I go to college before going into the military so I could go in as an officer. I had a guaranteed spot on an A Detachment as an 18D in the Reserves (you do the math) if I enlisted and passed the training. REP63 meant I essentially had an 18 X-ray pipeline more than a decade before the 18 X-ray program existed, and a detachment XO getting me ready for the Q Course.. One of the two teams open to me was a HALO team. Went to college. Military never happened. It would have been nothing to take 2 years off, do the Q, and go to college. I would have also had a reserve gig providing a paycheck, and the GI Bill, reducing the loans I needed to take out for an essentially useless degree.
That said, some research needs to be done, but IIRC an 81 on the ASVAB could severely limit the potential jobs available to him in the military. A study guide and re-test should be in order.
My daughter was an honors student in high school who won scholarships for college. She is now preparing to drop out of college, losing the student job she has. I am hoping she will take my advice and join the local Guard unit.
pat