Leslie Redford (Les) Clisby DFC (29 June 1914 – 15 May 1940) was an Australian fighter ace of World War II. Serving with the Royal Air Force (RAF), he was credited with sixteen aerial victories before being killed in action during the Battle of France. In a combat career lasting a matter of months, he was Australia's first ace of the war. Born in South Australia, Clisby joined the Royal Australian Air Force as a mechanic in 1935, but was later accepted for flying training. He graduated as a pilot in 1937, and chose to take a commission with the RAF. After arriving in Britain, he was assigned to No. 1 Squadron, flying the recently introduced Hawker Hurricane. Posted to France following the outbreak of World War II, he achieved his first aerial victory on 1 April 1940. Clisby became known as