FireFlight UAS unmanned aerial vehicles TwinHawk, Scout, Flanker, and Hawkeye 400, are displayed on the tarmac during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California, July 31, 2015. PHOTO BY REUTERS/Patrick T. Fallon