perform public duties in the capital. Composed by the RAAF's Director of Music, Squadron Leader Ron Mitchell (who was also director of the Air Force Band), it was officially adopted as the RAAF's new march music on 23 March 1983, replacing the Royal Air Force March Past, which had long been the RAAF's march as well as the marchpast of other Commonwealth air forces. Subsequently, journalist Frank Cranston wrote lyrics to the march and a musical score was produced by September of the following year. Roulettes The Roulettes are the RAAF's formation aerobatic display team. They perform around Australia and South-east Asia, and are part of the RAAF Central Flying School (CFS) at RAAF Base East Sale, Victoria. The Roulettes use the Pilatus PC-21 and formations for shows are done in a group of six aircraft. The pilots learn many formations including loops, rolls, corkscrews, and ripple roles. Most of the performances are done at the low altitude of . Future procurement This list includes aircraft on order or a requirement which has been identified: Up to 100 Lockheed Martin F-35A Lightning II (CTOL variant) with no fewer than 72 aircraft acquired to equip three operational squadrons. The remaining aircraft will be acquired in conjunction with the withdrawal of the F/A-18F Super Hornets after 2020 to ensure no gap in Australia's overall air combat capability occurs. On 25 November 2009, Australia committed to placing a first order for 14 aircraft at a cost of A$3.2 billion with deliveries to begin in 2014. In May 2012, the decision to purchase 12 F-35s from the initial 14 order was deferred until 2014 as part of wider ADF procurement deferments to balance the Federal Government budget. On 23 April 2014, Australia confirmed the purchase of 58 F-35A Lightning II fighters in addition to the 14 already ordered. Up to a further 28 aircraft may be acquired. The first two Australian F-35A Lightning II fighters were rolled out in July 2014, and began flying training flights with the USAF 61st Fighter Squadron in December 2014. A further seven Boeing P-8A Poseidons to be purchased and brought into service by the late 2020s, bringing the total number of aircraft to fifteen, was announced in the 2016 Defence White Paper. Six MQ-4C Triton unmanned aerial vehicles (UAVs) to expand the surveillance of Australia's maritime approaches, with the possibility of purchasing a seventh air frame. The drones