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Captain (title) redirects here; for the title held by the leader of a sports team, please see Captain (sports).
"I read once that a commander has to act like a paragon of virtue. I never met a paragon."
"Neither have I.
"

A commanding officer, abbreviated CO, was a term used to describe one's hierarchical position in relation to others within the same environment. On starships, it was general practice to address the commanding officer as "captain", regardless of their actual rank or position. Proper naval parlance said that, even if a vessel was commanded by an officer whose rank was lower than captain, that officer was still able to be referred to as a captain while on the deck of their own vessel, no matter their literal commissioned rank. In some cases the term "commander" was the chosen title. (DS9: "Behind the Lines")

Military units Edit

One meaning of commanding officer was the highest-ranking officer and commander of a unit. On starships, the CO usually held the rank of captain, though sometimes a commodore or fleet captain may have also held this position. On starbases, the CO was sometimes referred to as "portmaster" and was usually a flag officer. (TOS: "Court Martial", "The Menagerie, Part I", "The Menagerie, Part II", "The Deadly Years") Some bases, however, were commanded by commodores, captains or commanders. (Star Trek: Deep Space Nine seasons 1-3; TNG: "11001001"; TOS: "Balance of Terror", "Court Martial", "The Menagerie, Part I", "Arena", "The Deadly Years")

Commodore Matt Decker, mournful of the loss of his ship and crew, explained his rational for his suicide run at the "planet killer", stating, "The commander is responsible for the lives of his crew ... and for their deaths. Well ... I should have died with mine." Kirk, in turn pleaded "You can't throw your life away like this. Matt, you're a starship commander. That makes you a valuable commodity. We need you... your experience, your judgment. Matt! We're stronger with you than without you!" (TOS: "The Doomsday Machine")

It was also possible for lower ranks to be the commanding officer aboard a starship, such as the case with Lieutenant Commander Tom Markel aboard the USS Ariel. (TAS: "The Eye of the Beholder") Other examples included Starfleet Command temporarily assigning a number of officers to command vessels that blockaded the Romulan support of the House of Duras in 2368, including Lt. Cmdr. Data aboard the USS Sutherland. (TNG: "Redemption II") Lieutenant Commander Piersall commanded the USS Prometheus in 2370. (DS9: "Second Sight") Benjamin Sisko commanded the Defiant as a commander for nearly a year before he was promoted to captain. Major Kira Nerys and Lieutenant Commanders Jadzia Dax and Worf commanded the USS Defiant on a number of occasions. In 2373, Major Kira commanded the Defiant to destroy a Klingon minefield near the Bajoran system. Commander Worf assisted Captain Sisko in 2372 by bringing the Defiant to Earth to help quash Admiral Leyton's attempted coup d'état. Later, Worf helped his former commanding officer, Captain Jean-Luc Picard, in the Battle of Sector 001. Commander Dax commanded the Defiant in 2374 while operating out of Starbase 375. Her mission was to destroy a Dominion sensor array hidden in the Argolis Cluster. DS9: "Sons of Mogh", "Paradise Lost", "Behind the Lines"; Star Trek: First Contact)

Captain was a title typically held by commanders of merchant vessels and sometimes service craft. In 2367, Wesley Crusher remarked in a bemused manner that Dirgo was claiming to hold the rank of captain while serving as the master of the mining shuttle Nenebek. To this, Dirgo sternly told Crusher that yes, indeed, his rank was that of captain in comparison to Crusher's rank of ensign. (TNG: "Final Mission")

In general, commanding officers were dressed in the colors of the command division, but there were some exceptions in Starfleet uniform usage.

In rare occasions, the commanding officer needed not be a ranking officer, especially in dire circumstances. (DS9: "Valiant")

Dukat once claimed it was Cardassian tradition for the commanding officer to entertain his guests. (DS9: "Return to Grace")

The Takret Militia soldiers also refer to their superiors as commanding officer. (ENT: "The Catwalk") As did the Kelvan and the Kalandan people. (TOS: "By Any Other Name", "That Which Survives"

Chain of command Edit

The term "commanding officer" could also be used to refer to the officer whom one directly reported to in the chain of command or in a department. Occasionally, it simply identified an officer of higher rank in comparison to another, or the officer with the most experience if more than one officer held the highest rank at the time, although this was usually referred to as a ranking officer.

Leonard McCoy once pointed out to Spock that both of them answered to the same commanding officer, in which case he was referring to James T. Kirk. (TOS: "Amok Time")

Kirk, who greatly lamented the loss of three of security men on Gamma Trianguli VI, had his self-recriminations reassured by Spock, who explained that "No one has ever stated that Starfleet duty was particularly safe. You've followed the correct and logical course, done everything a commander could do." (TOS: "The Apple")

Lieutenant Commander Geordi La Forge once referred to himself as the commanding officer of Lieutenant Reginald Barclay. (TNG: "Hollow Pursuits")

Commander William T. Riker was adamant about following the orders of one's commanding officer when confronting his transporter duplicate Thomas Riker. (TNG: "Second Chances")

The Romulan defector "Setal" admitted to William Riker that his commanding officer was Admiral Alidar Jarok. (TNG: "The Defector")

Worf acknowledged the fact that Riker was his commanding officer before the latter agreed to the former joining him on an "unannounced visit" to the J'naii planet. (TNG: "The Outcast")

Riker again brought up the issue of one's commanding officer when he, under threats by Arctus Baran, demanded that Data withdraw the USS Enterprise-D from their attempt to stop Baran's mercenary ship. (TNG: "Gambit, Part I")

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