In early 1941, No. 21 Squadron, the squadron was re-designated a fighter unit and was sent to Sembawang to re-equip with the Brewster Buffalo.
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In August 1940, the squadron was dispatched to Seletar, on Singapore, where it operated its Wirraways in support of ground forces that had been stationed there amid concerns of war with the Japanese.
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In September 1943 No. 21 Squadron was re-formed at Gawler, South Australia, and re-equipped with Vultee Vengeance dive bombers.
The Sabre Squadron | RAAF Learmonth | No. 33 Squadron RAF | No. 263 Squadron RAF | squadron | Pacific Squadron | RAAF Curtin | No. 45 Squadron RAF | No. 127 Squadron RAF | No. 617 Squadron RAF | No. 43 Squadron RAF | No. 38 Squadron RAF | No. 107 Squadron RAF | German East Asia Squadron | Far East Squadron | Squadron (aviation) | RAAF Base Williamtown | RAAF Bare Bases | RAAF bare bases | No. 77 Squadron RAAF | No. 71 Squadron RAF | No. 49 Squadron RAF | No. 48 Squadron RAF | No. 2 Squadron RAF | No. 233 Squadron RAF | No. 133 Squadron RAF | Asiatic Squadron | 44th Fighter Squadron | 24th Tactical Air Support Squadron | 160th Fighter Squadron |