A 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. Massoud Hossaini /AP hide caption

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Massoud Hossaini /AP

The Rise Of The Drone, And The Thorny Questions That Have Followed

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The UNL NIMBUS Lab drone team hopes their technology will help ensure safer prescribed burns by keeping firefighters out of dangerous terrain. Ariana Brocious/NET News hide caption

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Ariana Brocious/NET News

Drones That Launch Flaming Balls Are Being Tested To Help Fight Wildfires

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A drone takes a practice flight in Virginia with medical supplies — part of a project to evaluate the flying machines for use in humanitarian crises. Pete Marovich/Bloomberg via Getty Images hide caption

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Pete Marovich/Bloomberg via Getty Images

A British Airways plane departs London's Heathrow Airport in 2010. Earlier this month, a British Airways plane was hit by an unidentified object but landed safely at Heathrow. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images

A U.S. Air Force MQ-1B Predator unmanned aerial vehicle, carrying a Hellfire missile, lands at a secret air base after flying a mission in the Persian Gulf region on Jan. 7. John Moore/Getty Images hide caption

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John Moore/Getty Images

UmmaGawd (Tommy Tibajia), a pilot in the Drone Racing League, flies his quadcopter in an abandoned power plant in New York. The Drone Racing League hide caption

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The Drone Racing League

A Video Game IRL: Drone Racing League Aims To Be NASCAR In The Air

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