Story of the REAL 21 Squadron As an element of the Citizen Air Force, 21 Squadron formed at Laverton in April 1936. In September 1939, 21 Squadron mobilised for war and after re-equipping with Wirraways the squadron began training in co-operation with the Army. The Squadron moved to Singapore in August 1940 and 12 months later were re-equipped with Brewster Buffalo fighters. With its new ...