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- For other uses, see Allegiance.
The USS Allegiance was a Federation starship in Starfleet service in the 23rd century. In 2254, the Allegiance visited the planet Alonis. One of the Allegiance crewmembers was an ensign, named John "Blackjack" Harriman, who met Los Tirasol Mentir on that world. (ST - The Lost Era novel: Serpents Among the Ruins)