The USN Harbinger was an Endeavor-class "Super"-Cruiser that served with the United States Navy and participated in all major battles in the beginning of the First War of Continuation, including the First Battle of Mars (June 21 2401), the First Battle of Earth (July 2 2401), the First and Second Battles of Ganymede (August 5 2401 & August 30 2401) and the First and Second Battles of PX-67/Vespene (September 19 2401 & October 24 2401). She was captained by High Captain Michael Dawson, a senior naval captain who served on the Court of Appeals. She harbored the 1st Marine Battalion, which fought during the Battles of Ganymede and PX-67 or Vespene. Both were among the few survivors of the nuclear detonation on Vespene on September 19, 2401.