I'd have him watch out for enlisting. The Navy too, watch out for that.
Seriously, finish the 4-yr degree, or go ROTC and go in as an officer.
Better yet, go coast guard. More action and less BS from everything I've heard about the CG. I grew up in San Diego, my Grandfather retired as a commander in the Navy, and my brother in law is in the Navy, but if I was making decisions today about what service to join, I'd still pick USAF as an officer or Coast Guard if I was going to enlist.