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FILE - In this Nov. 17, 2011 file photo, President Barack Obama and Australian Prime Minister Julia Gillard arrive to speak with Australian troops during a visit to Royal Australian Air Force Base in Darwin, Australia. During a visit last year in which he received an overwhelmingly popular reception, Obama announced that up to 2,500 U.S. Marines will be stationed in Australia's north for joint training exercises. Australian government fears of a public backlash were never realized. (AP Photo/Susan Walsh, File)

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FILE - In this Nov. 17, 2011 file photo, President Barack Obama and Australian Prime Minister Julia Gillard arrive to speak with Australian troops during a visit to Royal Australian Air Force Base in Darwin, Australia. During a visit last year in which he received an overwhelmingly popular reception, Obama announced that up to 2,500 U.S. Marines will be stationed in Australia's north for joint training exercises. Australian government fears of a public backlash were never realized. (AP Photo/Susan Walsh, File)
FILE - In this Nov. 17, 2011 file photo, President Barack Obama and Australian Prime Minister Julia Gillard arrive to speak with Australian troops during a visit to Royal Australian Air Force Base in Darwin, Australia. During a visit last year in which he received an overwhelmingly popular reception, Obama announced that up to 2,500 U.S. Marines will be stationed in Australia's north for joint training exercises. Australian government fears of a public backlash were never realized. (AP Photo/Susan Walsh, File)
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