No. 81 Wing RAAF is headquartered at RAAF Williamtown. It commands No. 2 Operational Conversion Unit, based at RAAF Williamtown, flying F/A-18A and F/A-18B aircraft, No. 3 Squadron, based at RAAF Williamtown, flying F/A-18 aircraft, No. 75 Squadron, based at RAAF Base Tindal, flying F/A-18 aircraft, and No. 77 Squadron, based at RAAF Williamtown, flying F/A-18 aircraft. 81 Wing is responsible for the provision of combat air power to Australian and coalition forces through Offensive Counter Air (OCA) and Defensive Counter Air (DCA) operations using three squadrons of F/A-18 Hornets, Nos. 3, 75 and 77 Squadrons.