User blog comment:Kvant 1/Battle of the Aces: Razgriz, Galm, Garuda, and Mobius./@comment-98.224.225.6-20111018203847

Technically Ribbon isn't the callsign of Mobius 1. In fact, We don't know Mobius 1's actual Callsign. They said Ribbon insignia because that's what it was on his Emblem.