"Duty: Memoirs of a Secretary at War" by Robert M. Gates is a signed hardcover book published by Knopf Doubleday Publishing Group in 2014. This memoir offers insights into the political and military policies of the United States during the wars in Afghanistan and Iraq, as well as Gates' personal reflections on his role as Secretary of Defense. The book, with 640 pages, covers a range of topics within the genre of biography, history, and political science, making it a valuable addition to the collection for those interested in military policy and American government.