Angus Hordern speaks with Len Traynor, historian and nephew of a Bomber Command rear gunner. Life on the Line tracks down Australian war veterans and records their stories. Every week we also have a bonus episode, where we speak to historians, authors and others in the veterans community. Today's bonus episode is with historian Len Traynor. Len is an expert in RAF Bomber Command of World War II. His uncle was a rear gunner on a Lancaster bomber and killed on his 30th operation.