Harmon was a member of the Federation Death Squad under Section Leader Klegg.

Harmon boarded the abandoned Liberator in the closing stages of the Intergalactic War. After seeing him help himself to part of the contents of the Liberator strongroom, Kerr Avon believed he was responsible for the murder of two other troopers on the ship. This provoked Harmon into attacking Avon, and was about to kill him when he in turn was shot and killed by Del Tarrant.