Flynn came from a broken home with his past similar that of G. Callen's. When he turned seven, Flynn's father was busted in a drug conspiracy and his mother was a drunk. During his childhood, Flynn went through several foster homes and opted to join the Marines the day he turned eighteen with the only other option being a street gang. According to Nate Getz, joining the Marines gave Flynn a place to belong and a structure he'd never had. He was eventually found innocent of the crime with Citdential's CEO Peter Caldwell being revealed as the true murderer.