Is there any in universe explanation as to why the Enterprise always gets to keep its 1701 registry number?

Also I don't recall any other starships from the TNG, DS9, Voyager time period that had this honor bestowed on it. Certainly Captain Sisko's second USS Defiant would have been worthy of it.

  • 1
    Memory Alpha: “Starfleet would sometimes use sequential lettering after a registry number was repeated to honor a former vessel” en.memory-alpha.org/wiki/Registry Sounds very plausible to me, although I don’t have time to find any canon quotes to back it up. – alexwlchan Mar 5 '15 at 7:16
  • 2
    You could as well ask why they'd need yet another Enterprise. Especially considering how often they use ship names rather than registry numbers in the series. :) – Mario Mar 5 '15 at 8:00
  • 1
    Are you asking why 1701 was chosen or why all enterprises carry that number (or both)? – Valorum Mar 5 '15 at 8:44

Certainly Captain Sisko's second USS Defiant would have been worthy of it.

In fact, it was. Sort of. As always, budget concerns.

The original Defiant Class USS Defiant was a Prototype ship bearing the NX registry class, full registry number NX-74205. Production models of the Defiant Class ship bear the NCC registry class, like the NCC-75633 USS Sao Paulo. After the original is destroyed, Star Fleet essentially gifts it to Sisko with permission to rename it as the Defiant. With this, it also reuses the Registry Number of NX-74205.

[The Second] Defiant has conflicting registry numbers. The dedication plaque on the bridge gave the registry as NCC-75633, but the plaque also contained the original name Sao Paulo. External CGI images seen in "The Dogs of War" and "What You Leave Behind" repeated the old registry of NX-74205 as a result of the extensive use of stock footage from earlier episodes, including "The Search, Part I", "Sacrifice of Angels" and "Tears of the Prophets". The new footage in "What You Leave Behind" continued to use NX-74205 for consistency. In the Star Trek: Deep Space Nine Companion, Ron Moore stated that he intended for the ship to be designated the "Defiant-A" but it wasn't shown on screen because it would have been prohibitive to repaint and reshoot the model for one episode. Memory Alpha uses the commissioning year to differentiate this ship from its predecessor.

Since DS9 wasn't picked up for an eighth season,or hasn't had remastered shots, we never see it shown as an A variant, but in-universe logic would require it.

Another ship is the Galaxy Class NCC-1305-E USS Yamato, sister ship to the Enterprise-D. Though this was apparently a production mistake that made it on screen. The ship later gets many different registry numbers.


I don't have a canon reference, but as that's a practice some real-world navies indulge in, it's not unreasonable to assume it's just an acceptable practice for ships of some distinction in-universe:

It should be noted that European navies reuse pennant numbers, so ships of the same name may have the same pennant numbers (Wikipedia)

An example given is the HMS Galahad (L3005).

  • In the US I believe only the name is reused, not the registry number (I can't think of any examples of registry number reuse). So that always seemed hokey to me. It makes me feel a bit better to know there are real world examples of the practice. – Jim2B Mar 5 '15 at 13:55

The reason for the Enterprise always having the same registration number with only an A, B,... added to it can be said in one word: Kirk.

To go into more details it was mentioned in the star trek films in passing. The original Enterprise 1701 had been destroyed in star trek 3. After kirk saved the earth again in star trek 4 at the end of it he got a new enterprise (or more a sister ship of her that got renamed). Because they wanted to honor him and the old enterprise they renamed the sistership to Enterprise and used the same registration number just with an A added to it at the end. With TNG it seems that they upheld this holding in honor of the Enterprise even almost 100 years later.

  • “To go into more details...” No! You said one word! – Paul D. Waite Mar 5 '15 at 20:17
  • This seems like mere speculation. Or can you provide any canon reference that states the Enterprise-A was the first ship to ever get a letter behind its registry number? – O. R. Mapper Aug 8 '15 at 9:41
  • Not a speculation in that sense. 1.) The question is only about the enterprise not generally. 2.) It is stated directly in the film that they added the A because they wanted to honor the Enterprise and Kirk and his crew and thus gave the ship the same name just with an A appended to it. – Thomas Aug 8 '15 at 10:47

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.