Master Chief Petty Officer
Master chief petty officer (MCPO) was an enlisted naval rate, a type of military rank used by the service organizations of different cultures.
As a traditional naval grade, a "MCPO" was the most senior grade of Chief Petty Officer, and was almost the highest noncommissioned officer grade in organizations like Star Fleet.
In comparison to infantry ranking systems, this rate was approximately equivalent to the most senior sergeant grade, such as Sergeant-Major. Personnel of this grade could be addressed simply as chief (or more properly, "master chief").
While nominally subordinate to all commissioned officers, Master Chiefs wielded far more influence and authority than most junior officers and acted as mentors and advisors to senior officers.
Master Chiefs had decades of practical experience and were an indispensable source of technical skill and leadership on Star Fleet vessels.
| Star Fleet Positions | ||
|---|---|---|
| Crew Positions | Tactical Officer • Engineering Officer • Security Officer • Medical Officer • Science Officer |  
|
| Officer Positions | Chief Tactical Officer • Chief Engineer • Chief of Security • Chief Medical Officer • Chief Science Officer • First Officer • Commanding Officer | |
| Flag Positions | Group Commander • Division Commander • Commander in Chief | |
| Academy Positions | Academy Instructor • Admissions Officer • Testing Officer • Evaluations Officer • Commandant (Academy) • Superintendent (Academy) | |
| Other Positions | Game Moderator • Game Moderator Administrator • Inspector General • Creative Director • Content Manager • President | |
| Trainees | Enlisted Personnel | Non-Commissioned Officers | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rct | CMR | CMA | CM | PO3 | PO2 | PO1 | CPO | SCPO | MCPO | CMCPO | MCPOSF | ||
| Trainees | Commissioned Officers | Flag Officers | |||||||||||
| Cdt | Mid | Ens | Lt[JG] | Lt | LCdr | Cdr | Capt FCapt |
Cmdr | RAdm | VAdm | Adm | FAdm | |
