Wallis applied for the RAF's Volunteer Reserve Service but was turned away because of an issue with his right eye. Consequently, he obtained a private flying licence, which required only a certificate signed by his GP. In 1938, Wallis again tried to join the RAF, but failed the eye test. He applied again in 1939 and finally passed the eye test, explaining, "I did the first line with my good eye then they covered it up and asked me to read the bottom line with my bad eye, without them realising I just turned my head slightly so I could again see with my good eye—I passed it with Above Average Eye Sight!" Wallis was commissioned in the
Royal Air Force Volunteer Reserve on 28 December 1940 as a
pilot officer (on probation), with seniority in that rank from 1 December 1940. His commission was confirmed on 28 December 1941 and he was promoted to
flying officer (
war substantive) with seniority from 1 December 1941. He was promoted to
flight lieutenant (war substantive) on 28 December 1942, with seniority from 1 December 1942. Wallis's military career started with
Westland Lysander patrols in the RAF. In 1942, he was transferred to
RAF Bomber Command, flying
Wellingtons from a base in Lincolnshire. Wallis subsequently served in
Italy and on secondment to the United States
Strategic Air Command, where he flew the massive
Convair B-36, which had six piston engines and four auxiliary jet engines. Following the end of the
Second World War, he was involved in research and development, and was awarded a number of patents on his inventions. On 1 May 1947, his service in the RAF was extended by four years and he transferred to the Technical Branch, with seniority in the rank of
flight lieutenant from 1 September 1945. He was given a permanent commission on 22 June 1948, allowing him to serve until retirement. He was promoted to
squadron leader on 1 January 1953, and to
wing commander on 1 July 1958. He left the RAF in 1964, retiring to
Norfolk. ==Autogyros==