Gunnar Lembcke Petersen is born on 1 February 1910 in Denmark. 
He enlists in the Royal Canadian Air Force on 1 February 1943 and is posted to No. 1 Manning Depot. On 19 March 1943 he is posted to No. 3 Flying Instructor School, presumably for temporary employment as a guard.
On 2 May 1943 he is posted to No.23 Pre-Aircrew Education Detachment and on 11 June 1943 to No.24 Elementary Flying Training School. On 20 July 1943 he is posted back at No.1 Manning Depot.
He is posted to No.1 Air Gunner Ground Training School on 3 September 1943 and to No.9 Bombing and Gunnery School for further training on 16 October 1943. At the same time he is re-classified as Leading Aircraftman. He graduates and gets a commission on 26 November 1943.
On 10 December he is posted to No.34 Operational Training Unit, 10 December 1943 for further training and on 26 February 1944 he is posted to "Y" Depot for service overseas.
He is taken on strength of No.3 Personnel Reception Centre, Bournemouth on 25 March 1944 and is promoted to Flying Officer on 26 May 1944.
He is repatriated to Canada on 6 February 1945, posted to No. 1 Air Command on 14 February 1945, and finally to No. 4 Release Centre on 12 March 1945. He is released on 1 April 1945. 
- Værslev parish record
- Service card, Directorate of History, courtesy of Hugh Halliday