Drone, drone, DRONE!
Oh, FFS, it's not a flippin' drone. Drones were so-called for their fixed pitch noise as they flew past for anti-aircraft "ack ack" training and also for being called the De-Havilland Queen Bee like this one below:
So drones are dumb target aircraft for surface to air practise or even air to air (like Jindivik or QF-4s).
RQ-170s are Remotely Piloted Air Systems (RPAS) or Unmanned Air Systems (UAS) and not a "drone" - although, this one may have been shot down so it might be deemed a "drone" after all
Lesson over
LJ