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President Barack Obama speaks with Amb. Matthew Barzun, U.S. Ambassador to the United Kingdom, after disembarking Air Force One at RAF Station Fairford, Gloucestershire, England, Sept. 3, 2014. Standing at right are Col. Angela Cadwell, Wing Commander, U.S. Air Force; and Col. Douglas Mellars, Installation Commander, U.S. Air Force. (Official White House Photo by Pete Souza)