Hardtalk speaks to a man who can provide a rare glimpse into a secret world. His story raises questions about the nature of 21st Century warfare. Brandon Bryant joined the US Air Force straight out of college. He was picked to join one of the United States' most controversial and important military programmes - the deployment of armed unmanned aerial vehicles - drones - to hunt down and kill some of America's most dangerous enemies. The experience has left him haunted and angry. Why? Show less