U.S. President Barack Obama, middle, and first lady Michelle Obama, right, react as Maite Nkoana-Mashabane, Minister of International Relations and Cooperation, left, gestures during their arrival at Waterkloof Airbase in Pretoria, Friday, June 28, 2013. President Obama is receiving the embrace you might expect for a long-lost son on his return to his father's home continent, even as he has yet to leave a lasting policy legacy for Africa on the scale of his two predecessors. (AP Photo/Themba Hadebe) ( South Africa Obama )