Is a top secret CIA black ops program, which now is owned and runned by Jason Bourne, recently the program before, taking over by Bourne, recruited only U.S. Service members to turn them into assassins. It used a behavior-modification program to break down the assassin's morality and make them effective killing machines. After the morality break down, presumably, the assassins recieved advanced training in sniping, hand to hand combat, and tradecraft. Jason Bourne was the last surviving member of Treadstone, and it belongs to him. But now a new team will be made and brought fourth. All will be working on this team, not just assassins.