Ibrahim al-Qosi worked as Osama Bin-Laden's bookkeeper, driver, and, cook. In 2002, at the height of the war on terror, he was imprisoned in Guantanamo Bay. But this week, the 52-year-old left for Sudan. His release is part of President Obama's longstanding but quiet effort to release prisoners from the controversial site. The president promised to close the base entirely by the end of his first year in office. But Al-Qosi was one of Gitmo's longest-serving inmates. His release brings the total detainee population at the base down to 168.