[1] Petty Officer Second Class Affiliation UNSC Navy Higher Rank Petty Officer First Class Lower Rank Petty Officer Third Class Known Petty Officer Second Classs Numerous SPARTAN-IIs L. P. Graves

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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 in rank 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-IIs upon graduation.^[2] This is most likely due to combat situations in which a Marine NCO has been neutralized, allowing a SPARTAN-II to take command of a squad.

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

Known PersonnelEdit

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