 With the ambition of becoming a pilot in the Royal Australian Air Force , Crombie undertook instruction in civil flying . Completing his course , he enlisted in the Air Force on 24 May 1940 . He was initially posted to RAAF Station Richmond , before transferring to No. 2 Initial Training School at RAAF Bradfield Park in June , where he was advanced to leading aircraftman . The following month , Crombie was attached to No. 5 Empire Flight Training School . On finishing his stint with the unit , he was posted to No. 2 <unk> Depot on 18 September . In a ceremony two days later , Crombie married Betty Deane @-@ Butcher ; the couple would later have a son . 
