Hair today, gone tomorrow??

My grandson, who is a senior in high school now, has very long - longer than shoulder length - hair.  It's beautiful dark almost black hair, nice and thick and he keeps it clean and neat but he does not tie it back in a man bun.  He has disliked having his hair cut since he was very young but I think his time is coming.  After he graduates his parents, both in the military, want him to join the Air Naional Guard.  There are all kinds of financial and educational benefits to this but it will mean the end of his flowing locks.  In the meantime though he's making the most of the hair situation.  He's in marching band and his band director informed him last year that he could not wear his hair down while he's marching in competitions.  I thought this might encourage him to get it cut but instead he has a cluster of (all girls) band members who pin his hair up for him before each performance. I think all that female attention is going to his head (pun intended).