Petty Officer First Class. This is a non-commissioned officer (NCO) rank, equivalent to a Staff Sergeant in the Army or Marines or a Technical Sergeant in the Air Force.
PO1 is a United States Navy abbreviation for Petty Officer 1st class. It is a paygrade of E-6, and follows the same base pay charts used by the rest of the military. PO1 is a rank that is in the NCO tier.
PO1 is a naval grade meaning Petty Officer 1. It the sixth Enlisted grade equivilent to a Technical Sergeant in the Air Force and a Staff Segeant in the Army.
