President Obama disembarks Marine One on Aug. 31, 2012, on his way to switch to Air Force One at Andrews Air Force Base, Md., for a trip to Fort Bliss in Texas. (Associated Press)

Photo by: Manuel Balce Ceneta

President Obama disembarks Marine One on Aug. 31, 2012, on his way to switch to Air Force One at Andrews Air Force Base, Md., for a trip to Fort Bliss in Texas. (Associated Press)