The USS Valdemar was an Ambassador class heavy cruiser that served in the Sixth Fleet during the Dominion War. She served as the entire fleet's flagship for Fleet Admiral Robert Skinner and was commanded Fleet Captain Cherok ch'D'Arv.
The starship was named for Valdemar Pouslen, inventor of the first tape recorder.
While under the command of Captain Calabrese the vessel was part of a task force assembled to combat an unidentified ship attacking Federation vessels in 2333. (STA novel: Enigma).
The ship was dispatched to the Demilitarized Zone 2370 along with the Prokofiev and Enterpise-D following the Cardassian arrest of ChiefMiles O'Brien. (DS9: "Tribunal")
In 2372 she was at Andoria for a change of command ceremony, where Captain Cherok ch'D'Arv assumed command of the vessel. ("Andorian Christmas")
Dominion War
Prior to the assault on the the Torros III Shipyard the vessel rendezvoused with the armada from the Typhon Sector in order for Fleet Admiral Skinner and his staff to come aboard. ("Declaration")
During Operation Return the ship's starboard nacelle and navigational deflector were badly damaged by a pair of Cardassian fighter craft.
After the retaking of Deep Space Nine and the Bajoran System from Dominion forces, a meeting of all wing, tactical wing and Fleet Captains was held aboard the Valdemar while in orbit of Prophet's Landing. After the meeting the ship headed forStarbase 375 for repairs.
After the Dominion War the Valdemar was replaced as the Sixth Fleet's flagship by the USS Merryweather when the vessel went into drydock at the San Fransisco Fleet Yards for a refit.