The was a series of Starfleet vessel in the Star Trek Fictional Universe , first put into service in the mid- 23rd Century . Ships of this class were multi-role, but generally used for exploration and diplomacy; however, they were quite capable in combat against ships of most enemy powers of their time, with an armament consisting of (at least) two Photon Torpedo launchers, two main Phaser banks, and a number of secondary phasers. In the late 2260s, the surviving ''Constitution''s underwent an extensive refit with major upgrades in or replacement of all primary systems, extending the class' lifespan by at least twenty years. The most notable of these changes were overall streamlining, upgrade of all major ship's systems, replacement of the external navigational deflector dish with a more powerful internal one, and replacement of the warp nacelles as well as the original Bridge module.
- USS ''Constellation'' (NCC-1017)
- ---Named for the USS ''Constellation'' , the starship ''Constellation'' was commanded by Commodore Matt Decker and was destroyed in 2267 by a massive planet-eating machine.
- '' (NCC-1700, ex-NX-1700)
- ---Named for the USS ''Constitution'' , the starship ''Constitution'' was the pathfinder of its class. Fate uncertain. Given that it has a higher registry number than several other ''Constitution'' class ships, some have speculated that either the lower-numbered ships were upgraded from a preceding class, or that NCC-1700 was actually the second USS ''Constitution'', and that its forerunner was the class pathfinder.
- USS ''Defiant'' (NCC-1764)
- ---Named for the '' episode reveals that it ended up in the Mirror Universe , and over 100 years in the past - where it was quickly discovered by the Terran Empire and used by the crew of the ISS '' Enterprise ''.
- USS ''Enterprise'' (NCC-1701)
- ---The ship featured in under the command of James T. Kirk . It was refitted from 2269 to 2271 and was destroyed in 2285 when Kirk ordered the self-destruction of the ship.
- USS ''Enterprise'' (NCC-1701-A)
- ---The second Constitution Class Starship to bear the name, it has been suggested by some fandom circles to have been a new Constitution Class ship (or variant of the class) constructed. Official Paramount Studios sources state that Gene Roddenberry had suggested that the Enterprise-A was the rechristened USS ''Yorktown'' (NCC-1717) , although this has never been officially established in any series or movie. The Enterprise-A was decommissioned in 2293 after the Khitomer Conference .
- USS ''Excalibur'' (NCC-1664)
- ---Named for the mythical sword Excalibur , the starship ''Excalibur'' was severely damaged by the ''Enterprise'' in 2268 while Richard Daystrom 's M5 Computer was in control of the ''Enterprise''. Presumed recovered.
- USS ''Exeter'' (NCC-1706)
- ---Named for the HMS ''Exeter'' , the starship ''Exeter'' was commanded by Captain Ronald Tracey in 2268 when she was found in orbit over Omega IV with its crew dead. The ''Exeter'' had become biologically contaminated, which had killed the crew and reduced them to their most basic elements. The ultimate fate of the ship was not known. Some resources have mentioned that the ship was scuttled by Starfleet due to the contamination, other sources say the ship was abandoned in orbit around Omega IV; or was recovered, decontaminated and returned to service. The ''Exeter'''s later career has been the subject of a series of fan-made short films in " Starship Exeter ."
USS Farragut (NCC-1647) the starship commanded by a Captain Garrovick. It was James T. Kirk's first starship post. In 2257, it was attacked by the Diakrome Cloud Creature, which killed over 200 crew members.
- USS ''Hood'' (NCC-1703)
- ---Named for the battlecruiser HMS ''Hood'' , the starship ''Hood'' was one of the ships faced by and nearly destroyed by the ''Enterprise'' in the M5 Computer test.
- USS ''Intrepid'' (NCC-1831)
- ---Named for the aircraft carrier USS Intrepid , the starship ''Intrepid'' was destroyed by a spacefaring organism in 2268. It was entirely crewed by Vulcans.
- a later Constitution class starship.]]
- USS '' Kongo '' (NCC-1710)
- ---On a deep space exploration mission as of 2293. Listed on computer readout screens in ''''. Named after a famous series of Japan ese warships.
- USS ''Lexington'' (NCC-1709)
- ---Named for the USS Lexington , the starship ''Lexington'' was one of the ships faced by and nearly destroyed by the ''Enterprise'' in the M5 Computer test.
- USS ''Potemkin'' (NCC-1657)
- ---The ''Potemkin'' was one of the ships faced by and nearly destroyed by the ''Enterprise'' in the M5 Computer test.
- USS ''Yorktown'' (NCC-1717)
- ---Named for the .'' According to official Paramount Studios sources, ''Star Trek'' creator Gene Roddenberry had suggested that the ''Yorktown'' was rechristened as USS ''Enterprise'' (NCC-1701-A) following the Probe Crisis. This, however, has not been officially established as Canon information by any movie or series. The questionable "Mr Scott's Guide to the Enterprise" states that the USS Ti-Ho was a vessel renamed to "Enterprise" in Star Trek IV.
:: The '''' speculates that the USS ''Yorktown'' may have became the '' Enterprise-A .''
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