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Senior chief petty officer

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Senior chief petty officer insignia
Starfleet, Late 2270s - 2350s
Starfleet, Late 2270s - 2350s
Starfleet, Late 2360s - Early 2370s
Starfleet, Late 2360s - Early 2370s
Starfleet, Mid 2370s -
Starfleet, Mid 2370s -

Senior chief petty officer (SCPO) was an enlisted naval rate, a type of military rank used by the service organizations of different cultures. As a traditional naval grade, SCPO was senior to a chief petty officer.

Personnel of this grade could be addressed simply as chief (or more properly, "senior chief"), and sometimes by their job title, such as "senior chief specialist." (DS9: "Shadowplay")

The rank of "senior chief petty officer" was never referenced in dialog, but is rather derived from rank insignia.
O'Brien was referred to usually as "chief" or "chief petty officer." He was referred to as chief petty officer in TNG Season 4 and again in DS9 Season 3 and beyond. Presumably the DS9 Season 2 reference in "Shadowplay" to "senior chief specialist", means the term "petty officer" can be used interchangeably with "specialist". In the US Navy "chief petty officer" can also be used interchangeably with "chief specialist". In Starfleet "SCPO" might be the person's rank, while "specialist" is their title.
This chart shows only general equivalencies based on the ranks used by many governments on Earth, as well as the rest of the galaxy.

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