 On his return to Australia , Crombie was posted for duties as an instructor with No. 5 Operational Training Unit at RAAF Station Williamtown in December 1943 . In March 1944 , Crombie piloted a Beaufighter from Brisbane to New Guinea , flying the aircraft in the local area for a period of eleven days testing the machine , before returning to Richmond , New South Wales . He was promoted to acting squadron leader on 1 September , and made chief flying instructor of No. 5 Operational Training Unit , heading the group 's two sections of Beaufighter and de Havilland Mosquito aircraft . 
