Like many other Marine Corps ranks, master gunnery sergeant was established permanently in the late 1950s. The MGySgt is the technical expert in their MOS.

The Marine Corps has two E-8 ranks: first sergeant and master sergeants. First sergeants act as senior enlisted advisers, while master sergeants have technical responsibilities in their job fields ...

In June 2010, Gunnery Sgt. Melugin took on the role of Course Chief for the Marine Corps Cannon Crewman Advanced Course at Ft. Sill, Oklahoma, and was later promoted to Master Sergeant.

Army Command Sgt. Maj. John Wayne Troxell, Senior Enlisted Adviser to the chairman of the Joint Chiefs of Staff, wearing the new SEAC rank insignia. (DoD Photo by U.S. Army Sgt. James K. McCann ...

U.S. Marine Corps Master Sgt. Sarah Nadeau recites the oath of enlistment during a ceremony at ... All ranks will still be able to request resignation or retirement six to 18 months in advance ...