"There was an unmanned QF-4 drone flying with an piloted F-4 manned chase plane with a pilot actually in the cockpit," Schonberger said.
"There's always somebody in the cockpit of the F-4 tailing the unmanned QF-4 and watching what's happening with the drone.
Those aircraft always fly over the Monument in their approach to land at Holloman. It's a pretty normal flight pattern in going over the monument.
That's when it crashed."