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In this March 12, 2016, file photo, Marines of the U.S., left, and South Korea, wearing blue headbands on their helmets, take positions after landing on a beach during the joint military combined amphibious exercise, called Ssangyong, part of the Key Resolve and Foal Eagle military exercises, in Pohang, South Korea. Ahead of the second summit between U.S. President Donald Trump and North Korean leader Kim Jong Un, some observers say there is an uncertainty over the future of the decades-long military alliance between Washington and Seoul. (Photo by Kim Jun-bum/Yonhap via AP Photo)
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