Sergeant is the fifth enlisted rank (E-5) of the UNSC Marine Corps and the UNSC Army and is a non-commissioned officer. It is equal to the rank of Petty Officer Second Class in the UNSC Navy and Staff Sergeant in the UNSC Air Force. Sergeants in the Army may lead fireteams of around 4 soldiers, while Marine Sergeants typically lead squads of around 12 other Marines.

While Sergeant is a rank on its own, the title 'Sergeant' is often used to refer to any enlisted ranks  of the UNSC Marine Corps or Army which carry the title Sergeant: 

  UNSC Marine Corps


UNSC Defense Forces Enlisted Ranks.

Air Force


Marine Corps