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High-five! Obama fist bumps on his way out of South Korea

Pablo Martinez Monsivais / AP

President Barack Obama greets members of the military and their families during his departure at Osan Air Base, South Korea, Tuesday, March, 27, 2012. Obama is returning to Washington after attending the Nuclear Security Summit in Seoul.

Jewel Samad / AFP - Getty Images

President Barack Obama greets U.S. soldiers and family members before boarding Air Force One at Osan Air Base in Osan outside Seoul on March 27, 2012 after attending the 2012 Seoul Nuclear Security Summit.