cain is for charlie and delta is for cain
Jason Bourne Years later, a black ops arm of the CIA was formed to eliminate the notorious Carlos the Jackal and called Treadstone Seventy-One, named after a building on New York's Seventy-First Street, and Webb was called up by the creator of Treadstone and Medusa, David Abbott, who was nicknamed The Monk, (short for The Silent Monk of Covert Operations) to be its principal agent. At this point, Webb (Delta) takes the identity of Jason Bourne due to the actual Bourne's status as MIA in the war as well as the fact that Bourne was in reality a ruthless killer with a long criminal record. The point of all this was to turn Jason Bourne into something more than he really was, a contract assassin who would be known all over the world for terminating the lives of just about anyone. The assassin's alias was Cain. The reasoning for creating such a myth was to create competition for the well-known assassin named Carlos, or Carlos the Jackal (real name Ilich Ramírez Sánchez) who at that time was considered the world's best and most famous assassin. The name Cain was chosen because it had some significance for what he was doing. During Vietnam, Cain was used instead of Charlie in the phonetic alphabet (Alpha, Bravo, Charlie, Delta, Echo, Foxtrot...) because Charlie became synonymous with Viet Cong. So Delta dropped back one letter to Cain, which stood for Charlie. In Spanish, Charlie is Carlos; Carlos was Venezuelan. The myth of Cain was created by having Cain take credit for any well-publicized killings that took place in Asia, and later in Europe, regardless of the circumstances. By creating this myth, Cain was to drive the reclusive Carlos out in the open "long enough to put a bullet in his head". To add insult to Carlos's name, Cain stole the credit for Carlos's kills, even when Cain had no part in them.