South Korea

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Soldiers of the U.S. Army 23rd chemical battalion wear gas masks while attending a demonstration of their equipment during a ceremony to recognize the battalion's official return to the 2nd Infantry Division based in South Korea at Camp Stanley in Uijeongbu, north of Seoul, Thursday, April 4, 2013. The 23rd chemical battalion left South Korea in 2004 and returned with some 350 soldiers in Jan. 2013. (AP Photo/Lee Jin-man)

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U.S. Secretary of State John Kerry speaks at a news conference with South Korean Foreign Minister Yun Byung-Se, not pictured, at the State Department in Washington, on Tuesday, April 2, 2013. (AP Photo/Jacquelyn Martin)

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The U.S. embassy in Seoul, South Korea, tweeted this picture of two F-22 Raptors on a recent training flight.

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South Korean soldiers patrol along a barbed-wire fence in Paju, South Korea, near the border village of Panmunjom, on Sunday, March 31, 2013. North Korea warned South Korea on Saturday that the Korean Peninsula had entered "a state of war" and threatened to shut down a border factory complex that's the last major symbol of inter-Korean cooperation. (AP Photo/Ahn Young-joon)

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A B-52 bomber is captured before joint training exercises between the U.S. and South Korea, March 2013. (U.S. Embassy, Seoul)

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A B-52 bomber is captured before joint training exercises between the U.S. and South Korea, March 2013. (U.S. Embassy, Seoul)

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U.S. Air Force Airman First Class, Lee Simpson from Sportanburg, S.C., mans a machine gun atop a humvee, with South Korean soldiers during a joint military drill between South Korea and the United States near the Osan U.S. Air Base in Pyeongtaek, south of Seoul, South Korea, Thursday, March 14, 2013. (AP Photo/Lee Jin-man)

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South Korean Army soldiers patrol along a barbed-wire fence near the border village of Panmunjom in Paju, South Korea, on March 11, 2013. North and South Korea staged dueling war games as threatening rhetoric from the rivals rose to the highest level since North Korea rained artillery shells on a South Korean island in 2010. (Associated Press)