Australia has always been one of the long-term and most trusted allies to U.S. in the Asia Patific region. Bilateral military relationships between two countries are extremely close. While U.S. implements the "global war on terror" after the 911 terrorist attacks, Australia showed its support unconditionally. Without a doubt, Australia became the vital player when U.S. laid out "Rebalancing" strategy in 2011. U.S. military deployment in Australia includes gradually deploying rotated 2,500 Marines by 2016, significantly increasing U.S. Navy and Air force's presence and conducting join exercises at Australian major ports and airports. Such a military deployment in Australia, Washington and Sydney are not just displaying their tight partnerships, but revealing U.S. strategic implications in Asia.