U.S. Marine Corps personnel stand at attention with the 5th Battalion Royal Australian Regiment on April 4, 2012, during an official welcome ceremony at Robertson Barracks in Darwin, Australia. The first detachment of 200 U.S. Marines has arrived in northern Australia, where a permanent joint training hub is taking shape as part of a U.S. shift of military strength in the Asia-Pacific region. (Associated Press/Australian Department of Defense)
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