Upon 621's arrival on Rubicon 3 under Walter's orders, Walter guides 621 in obtaining a mercenary license from AC wrecks so they can properly find work; eventually, they find a usable license with the callsign "Raven." Afterwards, Walter serves as Raven's (who Walter continues to refer to by their augmented human designation "621") Operator and manager, directing them to complete tasks and negotiating most of their contracts with Rubicon's numerous factions.
The independent mercenary Sulla claims to have killed several of Walter's "Hounds" in previous engagements.
