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White House physician Richard Tubb, seen at left, accompanies President George W. Bush as he arrives for a visit at Walter Reed Army Medical Center where he met with wounded soldiers in Washington, Monday, Dec. 22, 2008. Tubb performed an MRI of Bush's left shoulder in an attempt to understand why he has experienced pain recently.

President George W. Bush is accompanied by Army Col. Norvell V. Coots, commander of the Walter Reed Army Health Care System, before making a statement to reporters at Walter Reed Army Medical Center where he met with wounded soldiers in Washington, Monday, Dec. 22, 2008.

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US President George W. Bush talks to reporters after visiting wounded veterans at Walter Reed Army Medical Center in Washington, DC on December 22, 2008. The visit to Walter Reed was Bush's 16th as president. He told reporters it will likely be his last as commander in chief.