German Air Force Mission flies home after British tour. General Erhard Milch, German State Secretary for Air, Major-General Udet , the German wartime ace, and other members of the German Air Force Mission who have been touring Royal Air Force depots and aircraft factories in Britain, left, Croydon Aerodrome to return home. The visit was made in return for the trip to Germany of RAF officers last January. Photo shows, General Erhard Milch, leader of the German mission, shaking hands with air vice marshal Welsh as he left, Croydon. 25 October 1937