Prior to the Japanese attack on Pearl Harbor on 7 December 1941, the US Navy had been in action, but only in the course of carrying out defensive duties such as escorting convoys across the Atlantic. Pearl Harbor changed that completely, launching the full might of the United States into the now global conflict. In the years that followed, the US Navy incurred significant losses in every theatre in which it participated. Some of the losses were the direct result of combat, others of accidents and incidents. Richly illustrated and carefully researched, this book provides a unique record charting every loss incurred by the US Navy during the course of the Second World War.