 CHAR: Beckett is a Master Gunny Sergeant in the United States Marine  Corps. However, the crew chief of the helicopter that extracts him  in the opening scenes calls him "Gunny". The term "Gunny" is used as  a familiarity with Gunnery Sergeants only, and a Master Gunnery  Sergeant would NEVER be addressed as such. The closest appropriate  term for a Master Gunnery Sergeant would be "Master Guns".