Petty Officer is an enlisted naval rank used in Starfleet, with three different grades. It is senior to crewman and subordinate to chief petty officer. This rank is equal to a corporal in the infantry. Petty Officer 2nd class is equivalent to Sergeant and 1st Class is equal to Staff Sergeant.
This is the lowest rank to be considered a non-commissioned officer. People in this grade are generally referred to by their job title, so a petty officer is usually referred to as yeoman or specialist.
The class (such as Petty officer 2nd class) can be added to the end of a job descriptor such as yeoman 3rd class or specialist 1st class.
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