President Barack Obama salutes upon arrival at Osan Air Base to attend the Nuclear Security Summit, in Osan, south of Seoul, South Korea, Sunday, March 25, 2012. (AP Photo/Lee Jin-man)

Associated Press
President Barack Obama salutes upon arrival at Osan Air Base to attend the Nuclear Security Summit, in Osan, south of Seoul, South Korea, Sunday, March 25, 2012. (AP Photo/Lee Jin-man)
President Barack Obama salutes upon arrival at Osan Air Base to attend the Nuclear Security Summit, in Osan, south of Seoul, South Korea, Sunday, March 25, 2012. (AP Photo/Lee Jin-man)
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