I don't think any Beach Boy got drafted. One might have been in the
National Guard or something briefly. You may be thinking of Jan Berry
of Jan and Dean. (Dean Torrence, being the one who was involved in the
genius plot to kidnap Frank Jr.) Jan was a medical student while
puersuing rock fame,and during a hiatus was drafted: enraged he got in
his Corvette and slammed under a truck, a la Jayne Mansfield and
company. He wasn't killed but suffered brain damage and was
semi-functional the rest of his life, which ended late 2004 as I
recall. Those two crashes were the reason for "DOT bumpers" on trucks.
As well Richard "Battlestar Galactica" Hatch played Jan pretty well in
a early-80s TV biopic.

Glen Campbell is still a great guitar player and still a miserable
individual, at least on all three occasions I have been in his
presence.