United States Submarine Operations in World War II by Theodore Roscoe is a classic history of the role of the United States Navy submarines in World War II, earning him the title of "grandfather" of World War II American Submarine historiography. Because the book was written shortly after the war, later scholars have found errors or omissions in its facts. Nevertheless, the book's sweeping narrative maintains it as a classic text in the American submarine force; excerpts are often read at ceremonies where submariners earn their Submarine Warfare insignia.