Chief petty officer

Starfleet CPO insignia
File:Cage chief.png
2250s
File:Tmp chief.png
2270s
File:Mov cpo.png
2280s
File:Tng chief.png
2350s (all chiefs)
File:Tng cpo.png
2370s (conjecture)

Chief petty officer (CPO) is an enlisted naval rate, a type of military rank used by the service organizations of different cultures. As a traditional naval grade, CPO is senior to a petty officer, and is the highest enlisted grade in organizations like Starfleet and the US Navy. In comparison to infantry ranking systems, this rank is approximately equivalent to the more senior sergeant grades. Personnel of this grade can be addressed simply as chief, and sometimes by their job title, such as "chief specialist."

While chiefs are subordinate to all commissioned officers, they have far more experience and practical knowledge than ensigns and lieutenants, and are expected to act as mentors to them and to the junior enlisted assigned. As such, chiefs are often among the actual leaders in a Starfleet organization. Chiefs serve with distinction in most Starfleet branches and specialties, but are particularly visible in engineering and other technical trades. Wise is the ensign who heeds the advice of his chief, woe betide the ensign who disregards it.

There are usually individual grades of chief petty officers, differentiated by first, second class, etc; more senior CPOs are referred to as senior chief petty officer (SCPO) or master chief petty officer (MCPO), referred to as "senior chief" or "master chief" (respectively) in conversation.

Captain Kirk makes a reference to a "Chief," operating the transporter console in the TOS episode "Charlie X" (TOS), implying the existence of the rank of Chief Petty Officer at that time.

Commodore Mendez talks to a "Chief Humbolt" at the 'Computer Center' of Starbase 11 in the episode "The Menagerie, Part I" (TOS).

Captain Kirk, saved by an enlisted man from Chekov, who intends to assassinate him, is told that "Mr. Chekov was going to make me a chief, sir." "Mirror, Mirror" (TOS)

See also

• Starfleet ranks
• List of Starfleet enlisted personnel

List of chief petty officers

• Garrison
• Gladstone
• Miles O'Brien
• Sergey Rozhenko
• Humbolt

This chart shows only general equivalencies based on the ranks used by many governments on Earth, as well as the rest of the galaxy.