Andrews Air Force Base

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President Barack Obama waves as he boards Air Force One at Andrews Air Force Base, Md., Saturday, Nov. 17, 2012, en route to Southeast Asia. (AP Photo/Cliff Owen)

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** FILE ** Carry teams move transfer cases of the remains of the four Americans killed in Benghazi, Libya, from a transport plane during a ceremony Sept. 14, 2012, at Andrews Air Force Base, marking the start of congressional and State Department inquiries into the attack on the U.S. Consulate in Benghazi. (Associated Press)

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President Obama exits Air Force One at Andrews Air Force Base, Md., the day after he was re-elected President, Wednesday, Nov. 7, 2012. (AP Photo/Cliff Owen)

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The Marine One helicopter, with President Obama aboard, lifts Oct. 23, 2012, from the South Lawn of the White House in Washington, Wednesday, en route to Andrews Air Force Base, Md., then onto campaign events in Iowa, Colorado, California and Nevada. (Associated Press)

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President Obama walks from the White House to Marine One on Oct. 24, 2012, en route to Andrews Air Force Base, Md., then onto campaign events in Iowa, Colorado, California and Nevada. (Associated Press)

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President Obama waves Oct. 11, 2012, as he boards Air Force One at Andrews Air Force Base, Md., en route to Florida. (Associated Press)

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President Obama departs the White House on Oct. 11, 2012, for a short flight to nearby Andrews Air Force Base, Md., then on to Miami for a campaign event. (Associated Press)

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Carry teams move flag-draped transfer cases containing the remains of Americans killed in Benghazi, Libya, from a transport plane during a Transfer of Remains Ceremony on Friday, Sept. 14, 2012, at Andrews Air Force Base in suburban Washington. (AP Photo/Carolyn Kaster)

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** FILE ** President Barack Obama steps off Marine One upon arrival at Andrews Air Force Base, Md., Wednesday, Sept. 5, 2012, before boarding Air Force One en route to Charlotte, N.C., for the Democratic National Convention. ( AP Photo/Jose Luis Magana)

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President Obama boards Air Force One at Andrews Air Force Base, Md., en route to New York on Sept. 18, 2012. (Associated Press)

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President Obama boards Air Force One on Monday, Sept. 17, 2012, at Andrews Air Force Base outside Washington en route to campaign appearances in Ohio. (AP Photo/Carolyn Kaster)