Field Marshal Khalifa Haftar leads an army that controls most of Libya, stands at the gates of Tripoli and is threatening to overthrow the Government of National Accord. Backed by the powerful Libyan tribes, Khalifa Haftar has also won the backing of several international governments who see him as Libya's last hope of a democratic solution. Others portray him as a dangerous rogue commander with terrorist tendencies. But who is Khalifa Haftar, and...