Several years ago I used to go to a landfill site in Wiltshire and the Apaches were always flying over, I was having my 45 minute break parked on an escarpment looking over the vast country side. Sat in the truck I could hear the noise of the rotors but could not see nothing then the pilot came up from below me, very scary as it had all his guns and missiles attached, I waved, he waved and then was gone. Fantastic.