The Boeing C-17 Globemaster III is a large military transport aircraft. It was developed for the United States Air Force (USAF) from the 1980s to the early 1990s by McDonnell Douglas. The C-17 carries forward the name of two previous piston-engined military cargo aircraft, the Douglas C-74 Globemaster and the Douglas C-124 Globemaster II. The C-17 commonly performs strategic airlift missions, transporting troops and cargo throughout the world; additional roles include tactical airlift, medical evacuation and airdrop duties. Boeing, which merged with McDonnell Douglas in the 1990s, continued to manufacture C-17s for export customers following the end of deliveries to the U.S. Air Force. Aside from the United States, the C-17 is in service with the United Kingdom, Australia, Canada, Qatar, United Arab Emirates, NATO Heavy Airlift Wing, India, and Kuwait. The final C-17 was completed at the Long Beach, California plant and flown on 29 November 2015. The Royal Australian Air Force (RAAF) began investigating an acquisition of heavy lift aircraft for strategic transport in 2005. In late 2005 the then Minister for Defence Robert Hill stated that such aircraft were being considered due to the limited availability of strategic airlift aircraft from partner nations and air freight companies. The C-17 was considered to be favoured over the A400M as it was a "proven aircraft" and in production. One major RAAF requirement was the ability to airlift the Army's M1 Abrams tanks; another requirement was immediate delivery. Though unstated, commonality with the USAF and the United Kingdom's RAF was also considered advantageous. RAAF aircraft were ordered directly from the USAF production run and are identical to American C-17 even in paint scheme, the only difference being the national markings. This allowed delivery to commence within nine months of commitment to the program. On 2 March 2006, the Australian government announced the purchase of three aircraft and one option with an entry into service date of 2006. In July 2006 a fixed price contract was awarded to Boeing to deliver four C-17s for US$780M (A$1bn). Australia also signed a US$80.7M contract to join the global 'virtual fleet' C-17 sustainment program and the RAAF's C-17s will receive the same upgrades as the USAF's fleet. The Royal Australian Air Force took delivery of its first C-17 in a ceremony at Boeing's plant at Long Beach, California on 28 November 2006. Several days later the aircraft flew from Hickam Air Force Base, Hawaii to Defence Establishment Fairbairn, Canberra, arriving on 4 December 2006. The aircraft was formally accepted in a ceremony at Fairbairn shortly after arrival. The second aircraft was delivered to the RAAF on 11 May 2007 and the third was delivered on 18 December 2007. The fourth Australian C-17 was delivered on 19 January 2008. All the Australian C-17s are operated by No. 36 Squadron and are based at RAAF Base Amberley in Queensland.
