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Petty Officer Second Class is the fifth enlisted rank (E-5) of the UNSC Navy and is a Non-commissioned officer. It is equal to Sergeant in the UNSC Marine Corps and UNSC Army, or Staff Sergeant in the UNSC Air Force. Directly above is Petty Officer First Class and Petty Officer Third Class is the rank directly below. This rank is given to all SPARTAN-II's upon graduation. This is most likely due to combat situations in which a Marine NCO has been neutralized, allowing an SPARTAN-II to take command of a squad.

In informal settings, Petty Officers Second Class are typically called 'Petty Officer'.

Known Personel.

UNSC Defense Force enlisted ranks.

Air Force

Army

Marine Corps

Navy