An unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, on Jan. 31, 2010. U.S. drone strikes killed at least 13 people in two separate strikes Wednesday and Thursday in Pakistan's tribal area.
A 2011 photo shows an AeroVironment Puma drone being prepared for launch by University of Alaska researchers. The FAA says it approved BP's use of the drone to survey oil fields in Alaska.
A water-collecting drone hovers at a testing site in Lincoln, Neb., in 2013. The Federal Aviation Administration is working on rules for the commercial use of unmanned aircraft.