U.S. President Barack Obama (back L) and his wife, first lady Michelle Obama look at the official program booklet during the memorial service for late South African President Nelson Mandela at the First National Bank stadium, also known as Soccer City, in Johannesburg December 10, 2013. World leaders, from Obama to Cuba’s Raul Castro, will pay homage to Mandela at the memorial that will recall his gift for bringing enemies together across political and racial divides. REUTERS/Kai Pfaffenbach (SOUTH AFRICA – Tags: POLITICS OBITUARY TPX IMAGES OF THE DAY) – RTX16C24