My son said shaving your head is the worst thing you can do. He said it "takes the fun away" and the guys get singled out which evidently is not something desirable IHO
Now I was Army, but it's similar. The guys that came down with their hair already shaved got messed with as being GI Joe or Delta or something along those lines....
of course if you laughed, you ended up pushing the floor away for about the next hour or so :)