​​Wing Commander Wheeler was enlisted on 17 October 1940 in Ottawa and trained under the Empire Air Training Scheme. On 11 April 1941 he was awarded his wings and the rank of Pilot Officer in the Royal Canadian Air Force. He would rise through the rank from 1941 to 1944 to the rank of Wing Commander. During this time, he would be awarded a DFC. The citation of his award states:  

​‘In April 1942 Wing Commander Wheeler was leader of a second section of a formation of Boston aircraft detailed to attack the docks of Le Havre. Despite the very intense and accurate anti-aircraft fire by which his aircraft was repeatedly hit, Wing Commander Wheeler pressed home his attack. Immediately after releasing his bombs the port engine failed through the damage by anti-aircraft fire, and he was forces to leave the formation and follow behind. Steadily losing height he skilfully flew the damaged aircraft back to base. His skill and perseverance contributed largely to the safe return of the valuable aircraft and crew. In September 1941 at a low level and in the dace of intense anti-aircraft fire Wing Commander Wheeler attacked and sank a flak ship of between 800-1000 tons, which was escorting a convoy. He has displayed courage keenness and devotion to duty which have contributed largely to the success achieved. He has set a fine example.’ 

​On 15 February 1944, he was on a bombing raid to target construction works at Flottemanville which was located 25km south east of Cherbourg. His aircraft was seen to be hit by anti-aircraft fire and crash towards Cherbourg. Initially he was recorded as missing but in due course his death and burial at the Cherbourg Communal Cemetery was found. 

​An extensive file is held by the archives of the Government of Canada which gives a great insight into his service and reporting of his death over several years to his family. This is also included hand written letters to the Canadian authorities asking for information.​