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Joe Simko was a Starfleet security officer who was assigned to a Federation space station in the 24th century.
After Deep Space 9 was placed under Federation stewardship, Simko was one of two security officers who Odo established contact with, the other being Tarl Posset. Aidan Thorn, who knew Simko from Starfleet Academy, thought that Simko was glad that he had dealt with Odo while others hadn't, due to the valuable information that Odo provided him. (DS9 novel: Saratoga)