Petty Officer First Class is the sixth enlisted rank of the UNSC Navy and is a non-commissioned officer. It is equal in rank to Staff Sergeant in the UNSC Marine Corps and UNSC Army, and Technical Sergeant in the UNSC Air Force. It is directly above Petty Officer Second Class and below Chief Petty Officer.
In informal settings, Petty Officers First Class are typically called "Petty Officer."
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