The USS Karachi was a Merced class light escort serving in Starfleet during the 24th century.

Patricia Rivers was assigned to the escort as Chief Science Officer in 2347 and the vessel was assigned to border patrol duties on the Cardassian border.  

It had at least three hostile encounters with vessels of the Cardassian Eighth Order in the later 2340s.  During one incident, Rivers was able to mask the Karachi 's sensor profile and its two shuttlecraft to appear to be a trio of Excelsior class cruisers, deterring a pair of larger Cardassian vessels from crossing the border.

It was essential in laying the groundwork for the colonization of Dorvan V in 2350.

In 2372 Lieutenant Commander Lavin was the vessel's CO.  ("Ponn Farr")

During the Dominion War, the escort would be part of Task 621 under the command of Eldi.

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