OK, given that Trenchard neither fathered or invented the RAF I still stand by my proposition that the RAF is in desperate need of a second Trenchard to see it safely into its next century as the next CAS. That in turn is a response to the OP's question as to who from a very restricted list of candidates should fulfil that role. I am sure that we are all very appreciative of the historians' inputs, but the problem is urgent and immediate. The RAF, or at least its higher command, is bust and needs urgent fixing. Do we know a man who knows?