Barth served as a flight engineer and lieutenant within the military arm of the New Republic Defense Force.
Before his second tour of duty with Captain Sreas, during which they completed 19 missions over a four-month period, Barth was stationed with the New Republic's Third Fleet for a year. There, he operated as a drag pilot on a fleet tender.
While traveling on the fleet shuttle Tampion, Barth, together with Sreas and Commodore Han Solo, was taken prisoner by the Yevetha. During their imprisonment, Barth and Solo were presented to Viceroy Nil Spaar. Restrained and fearing for their safety, Barth implored Solo to "prevent a war" with the Yevetha. After Solo declined Nil Spaar's request to convince Leia Organa Solo to withdraw New Republic troops from the Koornacht Cluster, Nil Spaar killed Barth by disemboweling him from his hip up to his shoulder using his dew claw.
Barth possessed fluency in Basic, Bothan, and Corporate Sector Contract Standard. Furthermore, he had the capability to recite all nine water curses in the Mon Calamarian language.