. "use of drones" . . "kill or capture list" . . "kill list" . . "drone attacks in Yemen" . "drone assassinations" . "targeted killings of suspected enemies of the US" . . "drone assassination program" . . "drone program" . . . "Disposition Matrix" . "U.S. kill lists" . . "Disposition Matrix" . "Pentagon's involvement" . . . "drone assassination" . . "US kill list" . .