Japan

On September 2, 1945, the surrender ceremony for Imperial Japan occurred in Tokyo   Bay with General Douglas MacArthur officiating.

There are several films of this event. There was the official one MacArthur’s Signal Corps camera crew recorded.   There is a film from war correspondent William Courtenay and a finally a film taken by Commander George F. Kosco of the US Navy.

I have included in this post several versions of each of these films in black and white and color below.

The end of this ceremony marked the close of the most destructive war in human history whose 75th anniversary passed today.

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Today’s date, 6 August 2020 marks the 75th Anniversary of the atomic bombing of the Japanese city of Hiroshima. Some where in the neighborhood of 70,00080,000 people in Hiroshima were killed by the blast and resultant firestorm that reached it’s peak three hours after the detonation.   Japanese military personnel made up 20,000 of the 70,00080,000 immediate deaths.    This bombing set in motion a train of events including the subsequent atomic bombing of Nagasaki, the Soviet Union’s accelerated invasion of Japanese occupied Manchuria on 9 August 1945 and Emperor Hirohito’s 15 August 1945 broadcast of Japan’s surrender under the terms laid out by the Potsdam Declaration.

Much has been written on these events and I’ve revisited them here on Chicagoboyz annually from 2011 to 2018.   This year, 2020, I’m going to address a different part of the Atomic attacks.   Namely, how the American military electronically communicated about the Atomic bomb.   How the secrecy and limitations of that communications system meant Admiral Nimitz knew about the Atomic bomb long before General MacArthur. And how General   MacArthur was working to change that for the proposed and cancelled by A-Bomb invasion of Southern Japan

AMERICA’S SECRET TALKER

In World War 2 many of the major powers developed strategic level code & cypher radio electronic communications systems between it’s top level political & military leaders and the various theater commanders.   The German Geheimschreiber (secret writer) is the best known of these systems because British crypt-analysts at Government Code and Cypher School (GC&CS) at Bletchley Park with the the aid of eventually ten Colossus computers.

Much less well know is the Anglo-American equivalent of the  German  Geheimschreiber,   The US Army Signal Corps and Bell Telephone Laboratories SIGSALY.   This system was the only form of secret broadcast radio-electronic communications the American and British government trusted to transmit information on the Atomic bomb in the World War II.    It was due in large part to that level of communications security that Admiral Nimitz was informed of the atomic bomb before General MacArthur.   Admiral Nimitz in Hawaii and later Guam was reachable by SIGSALY after his initial courier briefing.   General MacArthur between October 1944 and May 1945 was not, for a number of reasons I’ll get into a little later.

First, a quick introduction: SIGSALY was a highly secret WW2 digital voice communications system that used a special one-time pad encryption.   There were only 12 station made in all of WW2 and MacArthur’s had two.   The first in Brisbane was sent to Manila.   The 2nd SIGSALY meant for Hollandia was instead placed in a Australian built barge barge in the SWPA “Signal Corps Grand fleet,” a motley collection of small ships and barges with powerful Signal Corps radios.   The barge mounted SIGSALY   was intended for quick sea movement and it was key for MacArthur’s communications at Okinawa and Kyushu during the planned invasion of Japan.

Figure 2 – This is a SIGSALY digital radio-telephone system screen captured from the Crypto Museum web site.    

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