I remember when I was flying overseas in a regional turboprop operator you could ad a phrase to your flight plan authorising the French Military to run a practice interception on your flight. It happened to me twice where we were informed by ATC of the incoming pair of Mirages, we told the passengers and then they arrived and practiced their signaling maneuvers followed by a chat on 121.5. One of the best memories in my flying career. I think my current employer would sack me for doing anything so reckless.