Marching Orders: The Untold True Story of How the American Breaking of the Japanese Secret Codes Led to the Defeat of Nazi Germany and Japan

The "extraordinarily informed" account of how US cryptographers broke Japan's Purple cipher to change the course of World War II (Kirkus Reviews, starred review).
Marching Orders tells the story of how the American military's breaking of the Japanese diplomatic Purple codes during World War II led to the defeat of Nazi Germany and hastened the end of the devastating conflict. With unprecedented access to over one million pages of US Army documents and thousands of pages of top-secret message...