I too can remember Leo De Vigne. I believe our paths crossed at Kharg Island during the period when Peter Boor was Chief Pilot. Leo was giving some Whirlwind familiarization to one of the many American pilots that Bristow had recruited at that time. I don't think Leo was getting through to one particular individual as, from a slight distance, I heard Leo in a slightly raised voice say "I know what it says in the Flight Manual, I wrote it"