
By the spring of 1941, the world was already at war. Hitler’s armies had swept across Europe, the Luftwaffe had bombed London, and U-boats prowled the North Atlantic. The United States was not yet formally in the fight, but the Navy was preparing for the possibility that it soon would be. Shipyards were running at full tilt, new battleships, carriers, and submarines sliding into the water. But building a modern fleet took time, and time was the one resource that seemed in shortest supply.

