USS Perseus (NCC-544) was a Saladin-class destroyer — of the Cochise-subclass — on active duty in Starfleet during at least the 23rd century. (Star Fleet Technical Manual) Stephen Penik served as a sciences officer on Perseus in the mid-2270s. (Star Trek: Avenger: "Star Survey") Perseus participated in the defeat of the Darnath in the Voranis system in June 2299. (Star Trek: Avenger: "The Road Goes Ever On")