 Complete the following phrase:  As well as training, over the course of No. 1 OCUs existence its aircrews flew operational sorties involving naval cooperation, aerial photography, target towing and radar targeting, and participated in exercises in Malaysia, Papua New Guinea, and New Zealand. During runway upgrades at Amberley in mid-1962, the unit was based for a month at RAAF Base Richmond, New South Wales. Later that year, it briefly maintained a detachment at RAAF Base Townsville, Queensland. On 11 September 1964, one of its Canberras was intercepted by a Sabre fighter of No. 76 Squadron based at RAAF Base Darwin, Northern Territory, as part of Operation Handover, a little-known contingency plan put into effect during 