AMBERLEY, AUSTRALIA – SEPTEMBER 21: In this handout image provided by Commonwealth of Australia, F/A-18F Super Hornet aircrew head to their aircraft in preparation for departure to the Middle East from RAAF Base Amberley on September 21, 2014 in Amberley, Australia. The main contingent of Royal Australian Air Force personnel and aircraft has departed for the Middle East today. Approximately 600 troops will be based on standby in United Arab Emirates for action in Iraq. (Photo by CPL Ben Dempster/Royal Australian Air Force via Getty Images)