George Catlett Marshall, Jr. GCB (December 31, 1880 – October 16, 1959), was an American military leader, Chief of Staff of the Army, Secretary of State, and the third Secretary of Defense. Once noted as the "organizer of victory" by Winston Churchill for his leadership of the Allied victory in World War II, Marshall served as the United States Army Chief of Staff during the war and as the chief military adviser to President Franklin D. Roosevelt.