The contract for the aircraft, which Australia will use for humanitarian missions as well as military operations, was finalized in June.
"I am delighted to accept the sixth C-17 on behalf of the Royal Australian Air Force," said Chief of Air Force Air Marshal Geoff Brown. "The C-17 is a capability that has improved Australia's reach locally, regionally and globally.
"Individually, the aircraft is impressive -- but as a fleet, it has fundamentally enhanced our strategic airlift agility to meet the Australian Defense Force Air Mobility requirements."
Boeing said it will provide after-delivery support to the Australian C-17 fleet as part of the C-17 Globemaster III Integrated Sustainment Program Performance-Based Logistics agreement with the U.S. Air Force.
"The C-17 symbolizes the strength and the enduring nature of the partnership between Boeing and the Commonwealth of Australia," said Bob Ciesla, Boeing's vice president, Airlift, and C-17 program manager. "We look forward to supporting the RAAF and this aircraft as we do the five other C-17s at (air base) Amberley."