First officer

Aboard a starship the first officer was the second-in-command, just below the captain. On a Federation starship, the first officer had the following functions:

In Starfleet the position was usually held by an officer with the rank of commander or lieutenant commander. The position was also referred to as executive officer (or XO).
 * Serve as the principal adviser to the captain
 * Implementing the captain's orders
 * Preparing and issuing duty rosters
 * Commanding the vessel in the event of the captain's absence, incapacitation or death
 * Working with the chief medical officer or counselor on crew evaluations

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.

Some noted first officers in Starfleet history were:


 * Subcommander/Commander T'Pol of
 * Lieutenant Commander (later Commander, and later Captain) Spock of the USS Enterprise (NCC-1701) and USS Enterprise (NCC-1701-A)
 * Commander William T. Riker of the USS Enterprise (NCC-1701-D) and the USS Enterprise (NCC-1701-E)
 * Major (later Colonel) Kira Nerys of Deep Space 9
 * Lieutenant Commander Worf of the USS Defiant (2370)
 * Commander Chakotay of the USS Voyager

The Starfleet of the alternate reality established in 2233 by the temporal incursion of the Romulan Nero had the following noteworthy first officers:
 * Lieutenant Commander George Kirk of the USS Kelvin
 * , first officer of USS Enterprise (alternate reality) (promoted by Captain )
 * Commander of the USS Enterprise

Earth Starfleet

 * Subcommander/Commander T'Pol
 * (2151-2161)

Federation

 * Commander Brink
 * USS Brattain (2367)


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


 * 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 Willard Decker
 * USS Enterprise (2272)


 * Lieutenant Ducane
 * USS Relativity (29th century)


 * Commander Flaherty
 * USS Aries (2365)


 * Commander Steve Gerber
 * USS Yamato (2365)


 * Lieutenant Commander Christopher Hobson
 * USS Sutherland (2368)


 * Commander Martin Madden
 * USS Enterprise-E (2379)


 * Commander Steven Mullen
 * USS Essex (2167)


 * Lieutenant Tom Nellis
 * Antares (2266)


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


 * Major/Colonel Kira Nerys (Bajoran Militia liaison officer)
 * Deep Space 9 (2369-2375)


 * Lieutenant Commander/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)


 * Matthew Ryan
 * (2151)


 * Lieutenant Saavik
 * USS 'Enterprise''


 * Lieutenant Commander/Commander Shelby
 * USS Enterprise-D (2367)


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


 * Snodgrass
 * SS Mariposa (2123)


 * Lieutenant Commander/Commander/Captain Spock
 * USS Enterprise (2266-2270)
 * USS Enterprise-A (2286-2293)


 * Lieutenant/Lieutenant Commander Worf
 * USS Enterprise-D (2370)
 * USS Defiant (2370) (2372-2375)
 * USS Sao Paulo (2375)~
 * (2373-2374)

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
 * (2373-2374)

Other

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


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


 * Tygarian - Romah Doek
 * Nanut

Mirror universe

 * Commander $𝜇$
 * (2165)


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


 * 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 (2258)


 * Cadet
 * USS Enterprise (2258)


 * Ayel
 * The Romulan mining vessel Narada

Apocrypha

 * Commander Worf
 * USS Enterprise-E (2380)


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


 * Commander Elias Vaughn
 * Deep Space 9 (Star Trek: Deep Space Nine (Pocket))


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


 * Commander Jon Cooper
 * Starbase 47 (Star Trek: Vanguard)


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

External link


Erster Offizier Primer Oficial Premier officier 副長 First officer Первый офицер Försteofficer