David Cortright : Up to 50 nations developing , buying weapons , including China , Iran , Pakistan . The prospect is a world in which every nation has drone warfare capability , he writes . White House counterterrorism adviser John Brennan claimed in June that no civilians have been killed in Pakistan in the last year because of drone strikes . Pakistan : Drones give nations false hope wars can be waged with less risk , costs . Be precise , but kill civilians : up to 775 Pakistanis . We must rethink military trend , he writes .
David Cortright : Up to 50 nations developing , buying weapons , including China , Iran , Pakistan . The prospect is a world in which every nation has drone warfare capability , he writes . Pakistan : Drones give nations false hope wars can be waged with less risk , costs . Be precise , but kill civilians : up to 775 Pakistanis . We must rethink military trend , he writes .