South Korea

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President Barack Obama waves to the cheering crowd as he arrives to speak in the Collier Field House at the U.S. Army Garrison Yongsan Saturday, April 26, 2014, in Seoul, South Korea, to U.S. and South Korean troops. (AP Photo/Carolyn Kaster)

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U.S. President Barack Obama addresses U.S. military personnel at Yongsan Army Garrison in Seoul, South Korea, Saturday, April 26, 2014. Obama is wrapping up his two-day visit to South Korea and will continue to Malaysia and the Philippines on his four country Asia visit. (AP Photo/Charles Dharapak)

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U.S. President Barack Obama is briefed by U.S.-ROK Combined Forces Command officers including U.S. Army Gen. Curtis Scaparrotti, right, Commander UNC/CFC/USFK, at the U.S. Army Garrison Yongsan, South Korea , Saturday, April 26, 2014. South Korean President Park Geun-hye was also at the briefing. (AP Photo/Carolyn Kaster)

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U.S. President Barack Obama arrives to address U.S. military personnel at Yongsan Army Garrison in Seoul, South Korea, Saturday, April 26, 2014. Obama is wrapping up his two-day visit to South Korea and will continue to Malaysia and the Philippines on his four country Asia visit. (AP Photo/Charles Dharapak)

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U.S. President Barack Obama addresses U.S. military personnel at Yongsan Army Garrison in Seoul, South Korea, Saturday, April 26, 2014. Obama is wrapping up his two-day visit to South Korea and will continue to Malaysia and the Philippines on his four country Asia visit. (AP Photo/Charles Dharapak)

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U.S. President Barack Obama arrives to address U.S. military personnel at Yongsan Army Garrison in Seoul, South Korea, Saturday, April 26, 2014. Obama is wrapping up his two-day visit to South Korea and will continue to Malaysia and the Philippines on his four country Asia visit. (AP Photo/Charles Dharapak)