Master Chief Petty Officer
|Master Chief Petty Officer|
|Higher Rank:||Fleet and Force Master Chief Petty Officer|
|Lower Rank:||Senior Chief Petty Officer|
|Known Master Chief Petty Officer||Known Master Chief Petty Officers|
|[ Source ]|
Master Chief Petty Officer (Abbreviated to MCPO and referred to as Master Chief or Chief) is the most senior regular non-commissioned rank used by Starfleet (there are also ranks called Master Chief Petty Officer of Obsidian Fleet and Master Chief Petty Officer of Starfleet - but these are the same minor variations, and would be reduced back to Master Chief if they chose to return to the fleet, rather than retire, as most do after hold the top NCO post in Starfleet; as Master Chief Petty Officer of Starfleet).
Master Chief Petty Officers generally only serve as department heads; or, more commonly, as the Chief of the Boat. They have many years of service and a wealth of experience in their selected field. There may only be one Master Chief Petty Officer aboard a particular ship (unless the other serves as a department head). Although, there may be more aboard a starbase.
Chief Petty Officers serve a dual role as both technical experts and as leaders, with the emphasis being more on leadership as they progress through the CPO ranks. A recognized, collateral duty for all Chiefs is the training of Junior Officers. Master Chief Petty Officers are at the top of the Enlisted/NCO ladder and can therefore not be promoted further; although they can apply for a warrant or commission