Among the dangers faced by the U.S. military, drones flown by hobbyists would probably not feature highly on the lists of most Americans.
Yet on Monday, the Pentagon gave 130 military bases across the country the green light to shoot down private and commercial drones. So why are military chiefs so concerned?
The number of unmanned aircraft in American skies has grown rapidly in recent years and the Federal Aviation Administration estimates there could be as many as 21 million operating in American skies by 2021.
In 2015, officials from the U.S. military, the Department of Homeland Security (DHS), and the FAA gathered at the DHS headquarters in Arlington, Virginia, to discuss the potential use of hobbyist drones by terrorists or assassins.