The story
On this date, Japan time, the Combined Fleet Order No. 1 was issued for additional radio communications to be generated to make US cryptanalytic efforts more difficult. Meanwhile, on the other side of the international date line, Joseph Rochefort's cryptanalytic team of the US Navy in Pearl Harbor, Territory of Hawaii reported that all Japanese Navy call signs had changed.
There's more to discover
You have arrived at just one small part of Back to Normandy — a personal project dedicated to preserving stories, images, music and memories of the Second World War.
Every record is a doorway to a larger story. Explore Back to Normandy to discover more, or visit Fred Vogels' personal website to learn about the person and the projects behind it.