President Barack Obama and First Lady Michelle prepare to depart Joint Base Andrews, Md., for Johannesburg, South Africa to attend a national memorial service for former South African President and anti-apartheid icon, Nelson Mandela on Dec. 9, 2013. Former President George W. Bush along, with former First Ladies Laura Bush and Hilary Clinton will be accompanying the first couple during the trip. (U.S. Air Force photo/ Airman 1st Class Nesha Humes)