Royal Australian Air Force Air Commodore Darren Boldie, Director General Air Combat Capability, flies in an F-35 Lightning II simulator during the Pacific F-35 Users Group Conference at Joint Base Pearl Harbor-Hickam, Hawaii, March 12, 2019. F-35 subject matter experts from the United States, Australia, Japan and the South Korea met to increase 4th and 5th generation aircraft theater interoperability. More than 80 personnel from the four nations discussed bed down and strategic concepts, operations, logistics and sustainment topics, all building on the success of the March 2017 F-35 Symposium. (U.S. Air Force photo by Staff Sgt. Daniel Robles)