U.S. Navy at War, 1941-1945, first published in 1946, is a series of three comprehensive reports submitted by Admiral King to the Secretary of the Navy during World War II. The book describes the start of the naval fleet buildup prior to the war; the naval campaigns in the Pacific, Atlantic, and Mediterranean; the D-Day landings at Normandy, naval research and development; submarine warfare; and other aspects of the war related to the U.S. Navy. Appendices list all U.S. ships added to the fleet between December 7, 1941 and October 1, 1945, a list of U.S. ships lost in combat, and the status of many ships of the Japanese Navy at war's end. Illustrated with maps and figures, "U.S. Navy at War" remains one of the best sources on the history of the Navy in World War II.