Obama in South Korea

President Barack Obama waves before his departure from South Korea at Osan Air Base in Osan, South Korea, Thursday, Nov. 19, 2009.

Rallying the Troops — AP Photo/Pablo Martinez Monsivais

President Barack Obama gets a hug as he rallies U.S. troops at Osan Air Base in Osan, outside Seoul, South Korea, Thursday, Nov. 19, 2009.

President Barack Obama shakes hands with U.S. service members during his visit at Osan Air Base in Osan, outside Seoul, South Korea, Thursday, Nov. 19, 2009.

President Barack Obama speaks to U.S. service members during his visit at Osan Air Base in Osan, outside Seoul, South Korea, Thursday, Nov. 19, 2009.

President Barack Obama rallies U.S. troops at Osan Air Base in Osan, South Korea, Thursday, Nov. 19, 2009.

President Barack Obama rallies U.S. troops at Osan Air Base in Osan, outside Seoul, South Korea, Thursday, Nov. 19, 2009.

President Barak Obama, left, and South Korean President Lee Myung-bak, right, are seen during the arrival ceremony at the Blue House in Seoul, South Korea, Thursday, Nov. 19, 2009.

President Barack Obama, right, and South Korean President Lee Myung-bak, left, are seen during the arrival ceremony at the Blue House in Seoul, South Korea, Thursday, Nov. 19, 2009.

President Barack Obama, left, and South Korean President Lee Myung-bak, right, are seen during the arrival ceremony at the Blue House in Seoul, South Korea, Thursday, Nov. 19, 2009.

A South Korean man holds a picture of President Barack Obama as police officers guard on a street near the U.S. Embassy in Seoul, South Korea, Thursday, Nov. 19, 2009. The Korean characters next to Obama's picture say "Welcome".

President Barack Obama, left, and South Korean President Lee Myung-bak embrace each other following a joint press conference at the presidential Blue House in Seoul, South Korea, Thursday, Nov. 19, 2009.

President Barack Obama points to his earpiece as he waits for the translation before answering a question during his joint news conference with South Korean President Lee Myung-bak at the Blue House in Seoul, South Korea. Thursday, Nov. 19, 2009.

President Barack Obama exits from Air Force One upon his arrival at the Osan U.S. Air Force Base in Osan, 30 miles south of Seoul, South Korea, Wednesday, Nov. 18, 2009. Obama arrived in South Korea for the last leg of his four-country Asian tour.

President Barack Obama, right, shakes hands with South Korean Foreign Minister Yu Myung-hwan after Mr. Obama walks down from the Air Force One upon arrival at the Osan U.S. Air Force Base in Osan, 48 kilometers (30 miles) south of Seoul, South Korea, Wednesday, Nov. 18, 2009. The president arrived here for the last leg of his four-country Asian tour.

President Barack Obama, right, is welcomed upon his arrival at Osan Air Base in Seoul, South Korea, Wednesday, Nov. 18, 2009.

President Barack Obama, right, greets with U.S. Air Forces officers upon arrival at the Osan U.S. Air Force Base in Osan, 30 miles south of Seoul, South Korea, Wednesday, Nov. 18, 2009. Obama arrived here for the last leg of his four-country Asian tour.