The USS Ascension (NCC-2520) was an Ascension-class dreadnought assigned to the Starfleet's Seventh Fleet in the 23rd century. It was launched, along with other vessels of its class, in 2281. (Federation Reference Series 3; Ships of the Star Fleet)

Its commanding officer in mid-2287 was Captain Daniel Halloran, Jr. Around this time, an encounter with a force-10 ion storm left Ascension damaged and temporarily out of action. (Star Trek: Avenger: "Operations Log — USS Avenger")

A training cadre for new Ascension command staff was led by J. David Abrahamson ca. 2289.

From the mid-2290s to early in the 24th century, it was commanded by James Pugliese. As of 2307, Pugliese held the rank of fleet captain.

The Ascension is one of the ships that attend a conference on the arboreal world code-named Yggdrasil in October of 2297. (Star Trek: Shadowstar Station: Timeline)

One of the sister ships of the Ascension was the USS Tai Shan.

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