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Chief petty officer (CPO) was a non-commissioned officer rank used by service organizations such as Earth's United States military and the Federation's Starfleet.

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What is the origin of the chief petty officer rank? toggle section
The chief petty officer rank originated in the 20th century United States Navy. In Starfleet, CPOs were non-commissioned officers with extensive experience, often mentoring junior officers. The rank included senior and master chief petty officers, and was prominent in technical fields.
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What is the role of a chief petty officer in Starfleet? toggle section
In Starfleet, chief petty officers are crucial leaders, often mentoring junior officers and serving prominently in engineering and technical roles. They can hold positions like Chief of Operations. The rank includes senior chief petty officer and master chief petty officer, reflecting their importance in Starfleet's hierarchy.
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How does a CPO rank compare to commissioned officers? toggle section
The chief petty officer (CPO) rank is a senior non-commissioned officer position, higher than a petty officer and the top enlisted rank in organizations like the US Navy and Starfleet. CPOs are influential due to their experience and mentor junior personnel, but they rank below commissioned officers, who hold authority through a commission.
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What is the significance of the CPO insignia? toggle section
The CPO insignia has changed over time, marking the rank's importance in organizations like the United States military and Starfleet. Initially, in the 2250s-2260s, it was a pin for Chief, Senior, and Master levels. By the 2270s, it became a sleeve stripe, then reverted to a pin. From the 2350s to 2370s, it was a black pip, and later a chevroned insignia with two pips. These changes highlight the chief petty officer rank's significance.
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How did the CPO rank evolve in the US Navy? toggle section
The chief petty officer (CPO) rank in the US Navy began in the 20th century. It is a non-commissioned officer rank, subordinate to commissioned officers but with more experience than junior officers. CPOs mentor junior personnel. The CPO insignia has evolved, featuring pins, sleeve stripes, and chevrons with pips.
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History

The origins of the rank chief petty officer can be traced to Earth's 20th century, where the title was used by the United States Navy. (Star Trek IV: The Voyage Home)

In Starfleet, chiefs were subordinate to all commissioned officers, but they generally had far more experience and practical knowledge than ensigns and lieutenants, and were expected to act as mentors to them and to the junior enlisted assigned. (DS9: "Starship Down", "The Ship") As such, chiefs were often among the actual leaders in a Starfleet organization, and could even hold the authoritative position of Chief of Operations. (DS9: "Emissary") Chiefs served with distinction in most Starfleet branches and specialties, but were particularly visible in engineering and other technical trades. (DS9: "Hippocratic Oath")

During the late 23rd century Starfleet chief petty officers were also defined as senior chief petty officer and master chief petty officer. (Star Trek II: The Wrath of KhanStar Trek VI: The Undiscovered Country)

When Sergey Rozhenko spied Miles O'Brien as the transporter chief aboard the USS Enterprise-D in 2367, Rozhenko was excited to meet another chief petty officer. When O'Brien introduced himself, he acknowledged Rozhenko as "sir", to which Rozhenko told him not to call him "sir," as he used to work for a living. Sergey's wife, Helena, then told O'Brien that he was just joking and that Sergey's proudest moment was when their son, Worf, had earned his commission. Sergey then added, "Imagine. An old enlisted man like me raising a boy to be an officer!" (TNG: "Family")

Several years later, O'Brien was identified by a Jem'Hadar as the rank of "chief petty officer," or "what Starfleet refers to as a "noncom,"" adding "you must have a great deal of experience […] that makes you a priority target." (DS9: "Hippocratic Oath")

In 2374, Cadet Dorian Collins of the USS Valiant introduced herself to Nog and Jake Sisko as "acting chief petty officer." (DS9: "Valiant")

List of chief petty officers

Master CPO
Senior CPO
CPO
Chief

Appendices

See also

Background information

Personnel of this grade can be addressed simply as "chief".

As a traditional naval grade, CPO was senior to a petty officer, and was the highest enlisted grade in organizations like the US Navy. In comparison to infantry ranking systems, this rank was approximately equivalent to the more senior sergeant grades.

Scripts for "The Cage" described Garison's rank stripe as "first crewman" and "bridge CPO."

In "Mirror, Mirror", Captain Kirk, saved by an enlisted man from Chekov, who intended to assassinate him, was told that "Mr. Chekov was going to make me a chief, sir."

In Star Trek IV: The Voyage Home, a chief petty officer contacts the CDO Commander Rogerson, regarding a power drain in the energy systems of the aircraft carrier Enterprise. The CPO's voice is not heard on screen, but the commander responds to the question "Yes, chief. We're tracking that too."

Information pertaining to the Star Trek films "senior chief petty officer" and "master chief petty officer" ranks originated from Robert Fletcher's personal costuming notes (p. 9, seen here) and later confirmed in multiple lots sold in the It's A Wrap! sale and auction. Props designated as "master chief petty officer, second class" were apparently designed and created, but did not appear on Fletcher's notes, were also among the costume props sold in It's A Wrap!. [1](X)[2](X)[3](X)

Additionally, the revised shooting script for Star Trek IV was prefaced with several production notes, including one that stated: "Please note that Master Chief Petty Officer Rand now first appears in Scene 25 and in all subsequent Starfleet Command scenes," replacing the previous script note reference to her being a lieutenant. A similar note appeared during the production of Star Trek: The Motion Picture, which originally listed her as an ensign, but was revised to chief (no sleeve stripes), due to her position as the transporter chief.

The Star Trek: The Next Generation Technical Journal (p. 35) labeled the single black pip insignia as a 2360s "ensign junior grade."

The first appearance of Miles O'Brien's chevrons-and-dots insignia was "Hippocratic Oath", which Miles O'Brien (and in one case, Dorian Collins) would wear through the end of the series. Several O'Brien uniforms with this insignia were sold as part of the It's A Wrap! sale and auction. [4](X)[5](X)[6](X)[7](X)[8](X)[9](X)[10](X)[11](X)[12](X)[13](X)[14](X)

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