Keith Laumer is known for the Bolo and Retief stories. Stories from the former chronicle the evolution of super tanks that eventually become self-aware through the constant improvement resulting from centuries of intermittent warfare against various alien races. The latter deals with the adventures of a cynical spacefaring diplomat who constantly has to overcome the red-tape-infused failures of people with names like Ambassador Grossblunder. The Retief stories were greatly influenced by Laumer's earlier career in the US Foreign Service. In an interview with Paul Walker of "Luna Monthly", Laumer states "I had no shortage of iniquitous memories of the Foreign Service."