Vietnam tested four American presidents. It took the lives of more than 58,000 Americans, and more than one million Vietnamese. In 2006, the John F. Kennedy Library hosted a landmark conference, which brought together some of the nation's foremost historians, journalists, veterans, and policy makers to discuss the lessons and legacy of the Vietnam War. As the American debate about what to do in Iraq continues, these lessons are more relevant than ever. (Conference audio courtesy of WBUR, Boston. Photo: Getty Images)