Andrews Air Force Base

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President Bush, carrying his dog Barney, salutes airmen as he disembarks Air Force One at Andrews Air Force Base, Md., after returning from Cincinnati, Ohio, Monday, April 3, 2006. (Associated Press) ** FILE **

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**FILE** Homeland Security Adviser John Brennan (right) and White House Chief of Staff Bill Daley accompany President Obama at Andrews Air Force Base, Md., on May 5, 2011, en route to New York City to visit ground zero and meet with first responders and family members of victims of the Sept. 11, 2001, attacks. (Associated Press)

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President Obama turns to wave as he boards Air Force One at Andrews Air Force Base in Washington's Maryland suburbs on Monday, Dec. 10, 2012, as he travels to the Daimler Detroit Diesel plant in Redford, Mich. (AP Photo/Charles Dharapak)

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U.S. Secret Service agents hold open the door as President Obama steps out of his vehicle to board Air Force One at Andrews Air Force Base in suburban Washington on Monday, Dec. 10, 2012, as he traveled to Michigan to visit the Daimler Detroit Diesel plant in Redford. (AP Photo/Charles Dharapak)

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President Obama's motorcade arrives in heavy fog at Andrews Air Force Base in suburban Washington on Monday, Dec. 10, 2012, before Mr. Obama departed for Michigan. (AP Photo/Ann Heisenfelt)

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In a transfer-of-remains ceremony at Andrews Air Force Base on Sept. 14, carry teams brought home the remains of the four Americans killed in an attack on the U.S. Consulate in Benghazi, Libya. Family members say they still don’t know exactly how their loved ones died. (Associated Press)

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** FILE ** Air Force One, with President Obama aboard, departs from Andrews Air Force Base outside Washington on Friday, Nov. 30, 2012, en route to the K'NEX construction toy company in Hatfield, Pa. (AP Photo/Jose Luis Magana)

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President Obama walks on the South Lawn at the White House in Washington on Friday, Nov. 30, 2012, before boarding the Marine One helicopter en route to Andrews Air Force Base in suburban Maryland and then on to Hatfield, Pa., to speak at the Rodon Group manufacturing facility. (AP Photo/Charles Dharapak)

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**FILE** Carry teams move flag-draped transfer cases of the remains of the four Americans killed in Benghazi, Libya, from a transport plane during the Transfer of Remains ceremony on Sept. 14, 2012, at Andrews Air Force Base in suburban Washington. (Associated Press)