In Fla we had a Special USMC Plate, real nice, but not as many spaces allowed as NC & XF was
Sem-F1!. In NC no special USMC plate, but with a little luck & creativity I was able to lockup
SEMPER-F! 
(8 spaces allowed, the - & !, only count as a 1/2 space each).

I was quite Happy about that, as it was the only way it could be done & it wasn't taken yet!
SF
BTW, I just noticed that my SF sig, could be SilverFox or Semper Fi, cool!