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A petty officer (PO) is a non-commissioned officer in many navies and is given the NATO rank denotation OR-5 or OR-6. In many nations, they are typically equal to a sergeant in comparison to other military branches. Often they may be superior to a seaman, and subordinate to more senior non-commissioned officers, such as a chief petty officers.
Petty officers are usually sailors that have served at least several years in their respective navies. Petty officers represent the junior and mid-grade non-commissioned officer ranks of many naval services, and are generally responsible for the day-to-day supervision of ranks junior to them. They may also serve as technical specialists within their rating (military occupation).