Master Chief Petty Officer

Master Chief Petty Officer is the most senior regular non-commissioned rate used by Starfleet (there are also ratings called Master Chief Petty Officer of Horizon Fleet and Master Chief Petty Officer of Starfleet - but these are the same pay grade as the standard rating). Master Chief Petty Officers generally serve in leadership roles in their respective departments (commanding engineering or security teams, for example), and may also serve in any officer post - including department head. They generally have many years of service and a wealth of experience in their selected field.