That would be Way to go MASTER Gunnery Sergeant...at least that's what it looked like, hard to tell, but Marines always address noncoms by their full rank, Sergeant, Staff Sergeant First Sergeant, Sergeant Major, etc...occasionally Gunnery Sergeants are called Gunny, but that's the exception.
somebody has a clue.
call this guy "sarge" and i'll punch you in the fucking throat.