In the year 2293, the Constellation, with her NX registry, was a participant for certification trials. (TOS movie: The Undiscovered Country) In 2371, the Constellation was ordered to Deep Space 9 to transport a Jem'Hadar child to Starbase 201 for study. (DS9 episode: "The Abandoned") During the Dominion War in mid-2374, it was assigned to assist the USS Defiant in the search for survivors of the Cardassian attack on the USS Honshu. (DS9 episode: "Waltz")