Carl Bergen , David Jones : So far , the United States , United Kingdom and Israel are the only nations that have used armed drones in combat . Drones cost a fraction of a private jet . They say the industry will double in size in next decade . Brazil , Russia , China , India are among countries developing military drones .
Carl Bergen , David Jones : Drones cost a fraction of a private jet . They say the industry will double in size in next decade . Brazil , Russia , China , India are among countries developing military drones .