Petty Officer First Class

Petty Officer First Class is a non-commissioned officer rate in Starfleet. A First Class Petty Officer is a senior enlisted person, having generally served at least five years in the fleet to advance within their rating (occupational speciality) to this level. First Class Petty Officers may supervise a group of junior enlisted within their same rating, and may be addressed by rating, such as "Hospital Corpsman First Class," "Master at Arms First Class," or "Matter-Antimatter Technician First Class," as well as by the generic Petty Officer First Class. PO1s take a competitive, fleet-wide exam to be promoted to Chief Petty Officer.