Robert Comsol wrote:
Why only 12 ships? IIRC the US Navy had 12 aircraft carriers in the 1960's and this was an inspiration.
This got me thinking. This chart may be of interest to some of you; as you can see there were a bit more than twelve carriers in service during TOS's run, though quite a few were ASW or amphibious carriers. And you can also see a number of familiar Starfleet names that were in service at the time.
(click for full size)