- As one of the original 17 bases authorized, Starbase 15 was likely constructed in the mid or late 22nd century.
In the year 2267, Starbase 15 was the closest base to the starship USS Enterprise when she encountered the telepathic group hive mind labeled "The Winged Dreamers".During this visit to Diad II, Kirk was overcome by the group mind and imagined Crewman Burnhard was manning the helm station and Kirk asked him to set course for Starbase 15. However, the bridge was empty at that moment. (TOS - The New Voyages short story: "The Winged Dreamers")
This base was in Starfleet Intelligence sector 3 ("SE sector intel"), which contained many colony and home star systems of Federation members. The central control for Starfleet Intelligence bases in this area was at Starbase 15. Intelligence units active for this sector in the 23rd century included the Starfleet Intelligence Internal Activities Unit, Starfleet Intelligence Gorn Activities Unit, Starfleet Intelligence Orion Activities Unit and Starfleet Intelligence Klingon Activities Unit. (FASA RPG module: Star Fleet Intelligence Manual)
Starbase 15 was nearby to Abaris and the Ceti system. In 2273, James T. Kirk received an urgent message from a commodore at Starbase 15. Abaris was due to collide with another planet in three days, and the USS Enterprise was the only ship in range to rescue two archaeologists stationed there. (TOS comic: "Aberration on Abaris")