Communication Intelligence Summary, 29
General.-Traffic volume above normal, The traffic to South China still very high. Automatic transmissions was
attempted on the Tokyo-Takao circuit
but was a failure and traffic sent by hand. A good share of today's traffic is made up of messages of an
intelligence nature. Tokyo Intelligence
sent eleven messages during the day to Major Commanders both ashore and afloat, while the radio
intelligence activity at Tokyo sent
four long messages to the Major Commanders. In addition to the stations normally reporting to Tokyo, radio
Yokosuka sent in reports. This station
had not previously been seen to submit reports. The Direction Finder Net controlled directly by Tokyo was up during
the night with much activity. One
message for Jaluit Radio Direction Finder Station included Commander Submarines for information. The Navy
Minister originated his usual two
AlNavs and the Naval General Staff addressed Commanders Second Fleet Third Fleet, Combined Ail Force and the
South China Units. The unit which has
been addressed as the "103rd Air Group" originated one dispatch today whose address was composed entirely
of enciphered calls. It is apparent
that he has no Navy call list. One address
was "JUITIKOUKUUKANTAI" "11th AIR *FLEET*". Since this has appeared before it is evident that the use of
KANTAI is intentional making the
existence of an air fleet positive. Its composition is unknown.
Combined Fleet:-The arrival of Air Squadron Seven in Takao area is confirmed. The presence of Cruiser Division
Four in that area is not confirmed nor
denied. The dispatches today indicate that the following units are under the immediate command of
CinC. Second Fleet:
DESRON TWO SUBRON FIVE
DESRON FOUR SUBRON SIX
THIRD FLEET CRUDIV FIVE
FRENCH INDO CHINA FORCE
Associated with Third Fleet are two Battleships but their assignment is
not yet definite. Aside from messages
which were addressed to Third Fleet,
China and South China Fleets, Combined Air Force and the Naval General Staff, Commander in Chief Second
Fleet was mainly occupied with the
units listed above. Only one message from Commander in Chief Combined Fleet was seen. This was addressed
to YOKOSUKA, Combined Air Force, CRUDIV
Four and BUMILAFF. The HIYEI sent one message to Chief of Staff Third Fleet.
Third Fleet.-Commander in Chief Third Fleet sent one message to Comdesron Five, Number Two Base Force, Number
One Base Force, Defense Division One
and Comdesron Two and Four. He held extensive communications with the Commander in Chief Second Fleet and BAKO.
Two more units of Third Fleet made
Fourth Fleet.--Relatively inactive today. Sent one message to Commander
in Chief Second Fleet, Commander in
Chief Third Fleet and Combined Air Force.
He is still in TRUK area.
Submarines.-Traffic for Commander Submarine Force was routed through SAIPAN today. He was at CHICHIJIMA yesterday.
South China.-CRUDIV Seven now in SAMA made a movement report but direction was not indicated. The French Indo
China Force Commander addressed several
messages to Second and Third Fleets as well as TOKYO. The Commander in Chief China Fleet was active
in addressing the South China Naval
Bases and the South China Fleets, all for information to Commander in Chief Second Fleet.
U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR ATTACK HEARINGS; PT. 35, THE CLAUSEN INVESTIGATION, PP. 62-81.
EXHIBIT "A" DAILY COMMUNICATION INTELLIGENCE SUMMARIES)