AdvertisementThe Rise Of The Drone, And The Thorny Questions That Have FollowedSeptember 08, 2016Tom BowmanfacebookEmailA U.S. Predator drone sits on the tarmac at the Kandahar military airport in southern Afghanistan in 2010. The U.S. has been using drones more and more frequently since the Sept. 11 attacks. They have been highly effective on the battlefield, but have raised legal and ethical issues. (AP)