More than 400 U.S. military drones have crashed out of the sky since 2001, according to a Washington Post investigation. Mechanical breakdowns, human error, bad weather and other reasons account for the crashes. The drones have crashed into homes, highways and other locations—in one case, into an Air Force C-130 Hercules plane in midair. No one has died in a drone accident, however. At least...not yet.
