Master Gunnery Sergeant

Master Gunnery Sergeant was a senior grade of sergeant that was unique to the Republic Marines. As the second-highest enlisted rank, master gunnery sergeants often served as staff aides to commanders. They were also called upon to lend their prodigious skills and years of experience to bear as post-graduate trainers for new officers or instructors at the Marine Corps' Officer Candidate Schools. Holders of this rank typically served for six or seven years before being considered for promotion to sergeant major.

Behind the scenes
The title, as well as the rank insignia, is based on the real-world rank held within the.