I admit it's complete conjecture, but you have a perfect scenario for a uav to take down a jet yesterday. 1. Everyone knew where the practice would be and could estimate the time of practice. 2. Smyrna is a very loosely controlled airport (I'm a pilot and have flown out of Smyrna). There are no scheduled flights out of Smyrna. Only charter, private, and a few military. Of course, it's not even necessary to be on airport property. There are residential neighborhoods in every direction. 3. It's easy to predict the active runway 4. The Blue Angels are probably the most photogenic squadron in the world 5. It takes one idiot with a $500 flying camera and no sense of others' well being to park it 200 feet in the air at the end of the runway.