 Complete the following phrase:  In January 1961, No. 81 Wing was re-established at RAAF Base Williamtown, New South Wales. Flying CAC Sabres, its complement included Nos. 75 and 76 Squadrons, as well as No. 2 Operational Conversion Unit No. 2 OCU and a re-formed No. 481 Squadron. In September 1964, Nos. 76 and 481 Squadrons deployed to RAAF Base Darwin, Northern Territory, as part of Operation Handover, a little-publicised contingency plan put into effect during the 