Gunnery Sergeant (UNSC)

ref>UNSC Marine Corps

Gunnery Sergeant is the seventh enlisted rank of the UNSC Marine Corps, and is a non-commissioned officer. It is equal to the rank of Chief Petty Officer in the UNSC Navy.

Gunnery Sergeants are commonly referred to by the informal abbreviation "Gunny." This nickname is generally acceptable for use in all situations except formal and ceremonial ones. Use of the term by lower-ranking personnel, however, remains at the Gunnery Sergeant's discretion.

Promotion
In their annual performance evaluations, eligible Gunnery Sergeants indicate whether they wish to be considered for promotion to Master Sergeant or First Sergeant, and thus whether they enter the promotional track for Master Gunnery Sergeant or Sergeant Major. Once promoted, the promotional track is permanent; lateral movement between the two programs is not possible.

One of the major differences between the two ranks is that First Sergeants/Sergeant Majors have a general command status, while a Master Sergeant/Master Gunnery Sergeant's role is as a provider of technical military leadership.