USS Lachesis was an Akyazi-class perimeter action ship — of unrevealed subclass — on active duty in Starfleet during the late 23rd century. (Star Trek: Shadowstar Station: "The Moirae") Lachesis was one of three perimeter action ships assigned to Task Force Moirae. The task force succeeded the destroyed USS Iblis in patrolling the sectors around Shadowstar Station after the events of Operation Blackjack in 2289. (Star Trek: Shadowstar Station: Operation Blackjack)