sentences:  On successfully completing the course and receiving his pilot's wings in July 1916, Croil was seconded from the Gordon Highlanders to the Royal Flying Corps with the temporary rank of captain.Croil became a member of the Canadian Air Board in June 1920 and played a key role in the establishment of air bases at Morley and High River in Alberta.On the establishment of the Royal Canadian Air Force in 1924, Croil was one its founder officers.