I once saw stated in a documentary, that at least 10-15 years ago, the Air Force started seriously cracking down on stunts by pilots. One example they gave is that B-52 crashing near an airport when the pilot tried to pull some stunt involving a very high-banked turn.
I think I saw that show. IIRC the pilot was a known hot dog with a B52 and he was chosen to show off for some brass with a tight turn to the left at low altitude, to be followed by a close fly by. He showed off all right, piling it up by dragging the left wing into the ground, resulting in the subsequent fireball.