Arthur-079 was abducted and conscripted into the SPARTAN-II program by Dr. Catherine Halsey in 2517 when he was six years old. He was then taken to the human colony world of Reach and trained by the AI Déjà and Chief Petty Officer Mendez along with the rest of the Spartan children.
Main article: Battle of the Unnamed Star System
In 2544, he participated in an operation to retrieve a captured Catherine Halsey from a Covenant fleet, along with a team consisting of Solomon-069, Kelly-087, Fred-104 and led by John-117. Operating a Booster Frame in an attempt to infiltrate a Covenant ship, he was crushed between two Cruisers while providing cover for Kelly-087, whose own Booster Frame had been damaged. Presumably, Arthur was listed as Missing in Action in accordance of the ONI Directive 930.