Four Royal Australian Air Force F-18's fly over a parked F-16 assigned to Misawa Air Base, Japan, during the 2011 Australia International Airshow on March 4. AIA takes place just outside of Melbourne, Victoria, Australia, and is one of the largest airshows in the world. The U.S. and Australian alliance spans more than 60 years and provides an opportunity for U.S and senior military officials to engage with their Australian counterparts, and ultimately contribute toward interoperability between the two forces.