USS Excalibur (NCC-1664)
USS Excalibur (NCC-1664) was a Federation  starship operated by Starfleet during the 23rd century. In 2268, the Excalibur was commanded by Captain .

In 2259, Lieutenant  wore a USS Excalibur pin for Starfleet Remembrance Day. ()

In 2268, the Excalibur was assigned to a fleet war games exercise pitting four starships against the , which was controlled by the revolutionary (but still experimental) M-5 multitronic unit. However, when the M-5 malfunctioned, it caused the Enterprise to fire phasers on the Excalibur at full power, when the ship's deflector shields were at minimum intensity. The Excalibur was severely damaged, with all hands lost. ()

Personnel

Appendices

Background information 
While the death of its entire crew is established, the status of the Excalibur itself is somewhat unclear. The  stated that the ship was destroyed. The fourth edition of the  offerd two possible conditions of the Excalibur - the ship was severly damaged (vol. 1, p. 254) or accidentally destroyed (vol. 2, p. 329). The episode itself provided no firm confirmation either way.

In the original version of the episode, a transposed image of the  from  was used to represent the Excalibur after the ship's destruction by M-5.

The registry of the Excalibur was not confirmed until it was seen on the CGI model in the 2008 remastered version of "The Ultimate Computer". The registry was first connected with the starship in Greg Jein's influential "The Case of Jonathan Doe Starship" article, published in the April 1973 issue 27 of the T-Negative fanzine. In the article, Jein had made an attempt to "logically" couple the registry numbers as seen in "Court Martial" with the names listed in the reference book The Making of Star Trek. His conjectural ship's registry has been subsequently propagated in the Star Trek Concordance and the Star Trek Encyclopedia, the latter co-authored by future remastering project Visual Effects Producer Michael Okuda, who made use of the remastering opportunity to elevate Jein's until then conjectural ship's registry to canon. With the high definition version of "Court Martial", the registry, which had been read as NCC-1664, was determined to be NCC-1864. This registry was that of the .

The name of the ship had already been established by the producers at the start of second season of , when they composed a list of fourteen ships belonging to the , still referred to as "Starship-class" by them at the time, including the Excalibur. The Excalibur has been a consideration from the start. (The Making of Star Trek, pp. 164-165) The name was considered due to the fact that page 27 of the first draft treatment of the script, dated May 15, 1967 for the second season episode , contained a line in which Captain Kirk stated,
"Excalibur and Endeavor are the other two ships assigned with us to Altair."
The reference though, was dropped from the episode as aired.

Apocrypha 
According to the Ships of the Line (p. 64), the USS Excalibur was commissioned at Tranquility Base, Luna as a Starship-class ship.

According to the Star Fleet Technical Manual the registry of the Excalibur was NCC-1705.

External link 
 

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Excalibur, USS, 1664