First officer

Aboard a starship the first officer or executive officer (or XO) was the second-in-command, just below the.

Duties
In Starfleet the position was usually held by an officer with the rank of commander or lieutenant commander.

In Starfleet's early period of existence, the first officer would accompany the captain on landing parties, depending on the situation. By the 24th century, however, it was the first officer who usually led away teams while the captain remained on the ship.

In the 22nd and 23rd centuries, the first officer served as a department head first and the executive officer second (similar to the second officer and third officer) and only took command when the captain left the bridge, as such, there was no first officer's station as there would be in the 24th century, as the XO would alternate between the command chair and their station as a department head.

Noted functions of the first officer aboard a Federation starship were:
 * The primary role of the second-in-command was to carry out the decisions of the Captain.
 * Obey and implement the captain's orders.
 * To be informed, insomuch as to know everything the captain knew. As well as had full security clearance to possess such knowledge. (
 * Attending important meetings and briefings with the captain.
 * Take command of the vessel in the event of the captain's absence, incapacitation or death.
 * To point out any actions that may be mistakes by a commanding officer.
 * To safeguard the lives of the ship's crew, including the captain.
 * Act as the officer in charge of personnel.
 * Preparing and issuing duty rosters.
 * Following the promotion of Acting Ensign Wesley Crusher in 2364, Captain Jean-Luc Picard told Crusher, that while he waited for his acceptance into Starfleet Academy, "you will learn this ship–every operation, every function," and that Commander William Riker would prepare a duty schedule for him, "heavy on study".
 * According to Captain Kathryn Janeway, if a member of the crew needs to leave their post, they are required to inform the first officer.
 * Coordinate personnel transfers between departments.
 * Working with the chief medical officer or counselor on crew evaluations.
 * Supervise subordinates.
 * When Hoshi Sato requested the help of T'Pol, Sato expressed her frustration with how frequently T'Pol was looking over her shoulder, double-checking her log entries, and translations. While T'Pol felt she was just doing her job, and explained how she held Sato to a high standard because "I know you're capable of achieving it."
 * Managing the ship's resources, including systems allocation.

Aboard a Klingon warship, the first officer served the Captain, but stood for the crew. They also reviewef and kept the ship's record of battle. 

Starfleet

 * Named:
 * Sub-Commander / Commander T'Pol
 * (2151–2161)


 * Commander Brink
 * USS Brattain (2367)


 * Lieutenant Maxwell Burke
 * USS Equinox (2370–2376)


 * Commander Michael Burnham
 * USS Shenzhou (2256)


 * Lieutenant Commander Cavit
 * USS Voyager (2371)


 * Commander Chakotay
 * USS Voyager (2371–2378)


 * Commander Pavel Chekov
 * USS Reliant (2285)


 * Lieutenant Commander Data
 * USS Enterprise-D (2369)


 * Commander Will Decker
 * USS Enterprise (2270s)


 * Lieutenant Ducane
 * USS Relativity (29th century)


 * Commander Flaherty
 * USS Aries (2365)


 * Lieutenant Commander Christopher Hobson
 * USS Sutherland (2368)


 * Commander Steven Mullen
 * USS Essex (2167)


 * Lieutenant Tom Nellis
 * Antares (2266)


 * Lieutenant Commander "Number One"
 * USS Enterprise (2254)


 * Colonel Kira Nerys (Bajoran Militia liaison officer)
 * Deep Space 9 (2369 – 2375)
 * USS Defiant (2370) (2371 – 2375)


 * Christopher Pike
 * USS Enterprise (2240s–2250)


 * Commander William Riker
 * USS Hood (Excelsior class) (2361–2364)
 * USS Enterprise-D (2364–2371)
 * (2365, part of the Officer Exchange Program)
 * USS Enterprise-E (2372–2379)


 * Commander Saru
 * USS Discovery


 * Commander Shelby
 * USS Enterprise-D (2367)


 * Lieutenant Commander Benjamin Sisko
 * USS Okinawa
 * USS Saratoga (NCC-31911) (2367)


 * Captain Spock
 * USS Enterprise (2266 – 2270)
 * USS Enterprise-A (2286 – 2293)


 * Lieutenant / Lieutenant Commander Worf
 * USS Enterprise-D (2370)
 * USS Defiant (2372–2375)
 * USS Sao Paulo (2375)


 * Unnamed:
 * Pegasus first officer
 * USS Pegasus


 * Phoenix first offcier
 * USS Phoenix

Klingon Empire

 * Hon-Tihl
 * (2369)


 * Kaz
 * (2269)


 * Korax
 * (2267)
 * (2269)


 * Commander Kurn
 * USS Enterprise-D (2366, part of the Officer Exchange Program)


 * Lieutenant Commander Worf
 * (2373 – 2375)
 * (2375)

Other

 * Human – Matthew Ryan
 * (2151, demoted in August to able crewman)


 * Ferengi – Kazago
 * Bok's Marauder (2364)


 * Tellarite – Gaavrin
 * Tezra (early 22nd century)


 * Tygarian – Romah Doek
 * Nanut


 * Romulan – Tal


 * Romulan – Ayel
 * Narada

Mirror universe

 * Commander $𝜇$
 * (2165)


 * Lieutenant Commander $𝜇$
 * USS Defiant (NCC-1764) (2155)


 * ISS Shenzhou (2257)
 * ISS Shenzhou (2257)


 * Commander $𝜇$
 * (2267)

Alternate timelines

 * Lieutenant Sato
 * Enterprise NX-01 (2165)


 * Commander Thelin
 * USS Enterprise (2269)


 * Commander Worf
 * USS Enterprise-D (2367 – 2370)


 * Commander
 * USS Enterprise (NCC-1701 alternate reality) (2258 – 2263)
 * USS Franklin (2263)
 * USS Enterprise (NCC-1701-A alternate reality) (2260s)


 * Commander
 * USS Enterprise (2258, 2259)

Apocrypha

 * Acting First officer
 * USS Enterprise (NCC-1701) (Desperate Hours)
 * Commander Jon Cooper
 * Starbase 47 (Star Trek: Vanguard)


 * Commander Sonya Gomez
 * USS Da Vinci (Star Trek: Starfleet Corps of Engineers)


 * Commander Shelby
 * USS Excalibur (NCC-26517) (Star Trek: New Frontier)


 * Lieutenant Commander Demora Sulu (2301 – 2311)
 * USS Enterprise (NCC-1701-B) (Star Trek: The Lost Era)


 * Commander Christine Vale
 * USS Titan (Star Trek: Titan)


 * Commander Elias Vaughn (2376 – 2379)
 * Deep Space 9 (Star Trek: Deep Space Nine (Pocket))
 * USS Defiant


 * Commander Worf
 * USS Enterprise-E (2380)

External link


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