David Cortright : Up to 50 nations developing , buying drones , including China , Iran , Pakistan . Their figures show that civilian casualties occur in about one fifth of U.S. drone attacks in Pakistan . Comment: Cortright : Drones give nations false impression wars can be waged with less risk , costs . Drones precise , but kill civilians : up to 775 Pakistanis . We must rethink military trend , he writes .
David Cortright : Up to 50 nations developing , buying drones , including China , Iran , Pakistan . Comment: Cortright : Drones give nations false impression wars can be waged with less risk , costs . Drones precise , but kill civilians : up to 775 Pakistanis . We must rethink military trend , he writes .