Star Trek Expanded Universe
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Starbase 15 was a United Federation of Planets facility active in the 23rd century.

In September, 2256, USS Avenger underwent repairs here before being redeployed to the Klingon front. (Star Trek: Avenger: "Early History of the USS Avenger")

Admiral Robert Sinclair commanded the starbase in the early 2260s. (Starship Ajax)

In 2268, John "Jack" Raintree was promoted to commodore and given command of the starbase. (Orion Press: "Incident on Xantharus", Remember the Hood)