Star Trek Expanded Universe
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Starbase 27 was a United Federation of Planets facility active in the 23rd century. It was located on Trylias (Orion Press: The Daystrom Project), a class M planet near Omicron Ceti III (TOS: "This Side of Paradise") and the Organian Treaty Zone.

Puffin-class fightercraft, deployed by the Swordfish-class carrier USS Narwhal, engaged a D4-class ship operated by rogue Klingon elements in 2224. Outmatched, Narwhal made a strategic withdrawal to Starbase 27, whence two Kestrel-class light cruisers -- Mononykus and Shrike -- were dispatched to deal with the Klingons. (The Starfleet Museum: 23rd-Century Carriers and Fighters)

In 2275, prior to a Klingon attack, the starbase had a population of half a million. It was destroyed by a Klingon vessel but rebuilt later that year. (The Daystrom Project)

USS Auriga and its surviving crew were taken to the starbase following an attack on that ship by Romulans in October, 2287. (Star Trek: Avenger: "By Honor Bound")

Task Force 18, which included USS Ki Rin, was homeported at Starbase 27 in the early 2290s. ("The USS Ki Rin: A New Twist on the Strike Cruiser Concept")

In October 2294, following the crippling of Starbase 29 in an attack by an energy creature, Commodore Barry Johnson was moved to the starbase medical facilities for recovery. (Star Trek: Avenger: "Aftermath")

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