Petty Officer

In the One Piece universe "Petty Officer" (伍長) is a a lower marine rank below Chief Petty Officer and above Seaman First Class. Sometimes it is also translated as Petty Officer Third Class.

Once a marine rises to this rank, he or she is allowed to wear many different uniforms or even civil clothes. However, many Petty Officers prefer to appear "sailor-like" and continue wearing the traditional uniform.