Polzin. I believe the Belgian story is well covered in UFO books, etc and I cannot recall all the detail - even though there was a prog on the TV over here about it not too long ago. The whole thing centered on a triangular shaped flying machine which was observed in other places as well as Belgium.... it's just that the Belgian authorities went public on it. The TV prog had film from the F-16 gun cameras, etc and it was a well-presented documentary. I'm sure there must be plenty of webs ites covering the matter too..
I agree that they may not necessarily be driven by little green men but just who is driving them?