The use of unmanned aerial drones has dominated the way the US fights al-Qaeda and other armed groups around the world.
But many of the people who developed and refined the aircraft say they never intended for their work to be used in conflicts.
As part of Al Jazeera's series on civilian uses of drones, Rob Reynolds visited designers who still hope their inventions can be used for more peaceful purposes.
Tod McGeer, the company chief of Aerovel, a manufacturer of drones, said: "I would rather not be killing people. I would rather be creating wealth, creating better weather forecasting. I would rather be finding minerals."