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Barack Obama works on his address to the nation with Ben Rhodes, Deputy National Security Adviser for Strategic Communication, aboard Air Force One before landing in Afghanistan.

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Barack Obama greets U.S. troops at Bagram Air Field in Afghanistan.

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Barack Obama addresses the nation from Bagram Air Field in Afghanistan.

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Barack Obama greets hospital personnel in the ICU at Bagram Air Field. The President presented ten Purple Hearts, three in the ICU.

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Afghan President Hamid Karzai listens as President Barack Obama delivers remarks during the strategic partnership agreement signing ceremony at the Presidential Palace in Kabul, Afghanistan.

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Senators Jack Reed, right, and Carl Levin, listen during the strategic partnership agreement signing ceremony at the Presidential Palace in Kabul. The Senators happened to be in Kabul and were told about the president's visit only a few hours beforehand.

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Barack Obama sings "Happy Birthday" to Bloomberg White House reporter Julianna Goldman in the press cabin on Air Force One during the return flight to Washington from Afghanistan.