9 Squadron was formed on 1 January 1939 at RAAF Base Richmond by renumbering No. 5 Squadron. On formation, the squadron's first commanding officer was a Royal Air Force officer, Squadron Leader J.A.S.
9 Squadron was established on January 1st, 1939, at RAAF Base Richmond through the renumbering of No. 5 Squadron. The first commanding officer of this new squadron was Squadron Leader J.A.S., a Royal Air Force officer.