Master Sergeant (E-8)

This is a senior Non-Commissioned Officer position. Master Sergeant is equal to rank with the First Sergeant but is considered a technical specialist rather than a personnel specialist. They may serve at the Battalion level or above, using highly proficient MOS to advise officers on equipment and programs.

To earn the title of Master Gunnery Sergeant of marines, a marine must be the absolute pinnacle of technical skill in their MOS, and must demonstrate leadership on par with a Sergeant Major, with the added experience and technical skill to be the best in their field, the absolute authority on their area of expertise.

Master Sergeants serve in a fluid role based on the needs of the unit.