Gannon joined the Followers of the Apocalypse to find a peaceful application for his skills and began working in Freeside. They eventually settled in the Mojave Wasteland and started new lives, their past associations kept secret for fear of further reprisals. Between the Republic and the Brotherhood of Steel both launching aggressive campaigns to track down all personnel that hadn't already been killed or detained during the siege, the Remnants were forced to retreat further into the eastern territories. In the wake of the NCR's capture of Navarro, the group fled the area and attempted to integrate into civilian life, but this was short-lived. As he grew up, he bonded closely with his mother and his de facto family, the Enclave Remnants, a group that had formerly served in the same unit as his father.
His father died while Arcade was still an infant, killed in combat on an away mission to this day, the specifics of his father's death are unknown to him. Arcade Gannon is the son of an Enclave officer, born in Navarro in 2246, four years after the destruction of the Poseidon oil rig.