Frank Moses: Kordeski trained you?
William Cooper: Yeah?
Frank Moses: I trained Kordeski.
Near the start when the assassins come after Frank, Frank injects one with the syringe that was intended for him. The half of the syringe that has no liquid has a noticeable plastic grey color. It then cuts to the close-up, and the half with no liquid now has no grey color.
Frank Moses' file, seen when Cooper is told he is his next target, gives Frank's date of birth as March 19, 1955. This is Bruce Willis' date of birth.