After entering the
Royal Canadian Air Force (RCAF), Bannock received his pilot's wings in 1940 and was appointed as an instructor at
Trenton, Ontario. Later he was posted to
Royal Air Force Ferry Command from June to August 1942. In September 1942, Bannock became chief instructor with the Flying Instructor School at
Arnprior in Ontario. Bannock's request for overseas service was granted in 1944 and he joined 60
OTU based in
RAF High Ercall, England. In June 1944, Bannock was then transferred to
No. 418 Squadron RCAF, flying intruder missions over Europe with the
de Havilland Mosquito Mk. VI fighter-bomber. He quickly proved adept at this type of operation and achieved his first victories. In October 1944, he was promoted to Wing Commander and took command of the squadron. Bannock also flew 'Diver' operations against the German
V-1 "flying bombs" launched against London and southern England. On one mission he shot down four V-1s in one hour. A
bar to his
Distinguished Flying Cross (DFC) was added for his missions against the V-1s. Bannock was transferred to
No. 406 Squadron RCAF in November 1944 as commanding officer, and was awarded the
Distinguished Service Order (DSO). By April 1945, Bannock had destroyed 11 enemy aircraft (including 2 on the ground), 4 damaged in the air and 19 V-1's destroyed. Bannock became Director of Operations,
RCAF Overseas Headquarters, in London in May 1945 until September 1945 when he attended the Royal Air Force Staff College. ==Post-Second World War==