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A US military officer (C) is seen as South and North Korean soldiers stand guard at a joint security area known as Panmunjom in the Demilitarized Zone dividing the two Koreas on May 10, 2008. A US envoy crossed the inter-Korean border into South Korea, bringing with him documents about North Korea's nuclear activities as part of efforts to disarm the communist state. AFP PHOTO/JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)

A US military officer (C) is seen as South and North Korean soldiers stand guard at a joint security area known as Panmunjom in the Demilitarized Zone dividing the two Koreas on May 10, 2008. A US envoy crossed the inter-Korean border into South Korea, bringing with him documents about North Korea's nuclear activities as part of efforts to disarm the communist state. AFP PHOTO/JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)