Master Chief Petty Officer

This article is considered a canon article for Star Trek: Equilism.

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, MCPO was the most senior grade of Chief Petty Officer, and was almost the highest noncommissioned officer grade in organizations.

Personnel of this grade could be addressed simply as chief (or more properly, "master chief"), and sometimes by their job title, such as "master chief specialist."

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 Starfleet vessels.

When there were individual grades of Chief Petty Officers, Senior Chief Petty Officer (SCPO) was subordinate to MCPO.