Communication Intelligence Summary,
November 28, 1941
General.-Traffic volume normal. Communications to and from South China and between Mandates and Empire very heavy.
No tactical traffic seen. As has been
previous]y reported the suspected Radio Intelligence net is very active and is becoming more so. The
TOKYO plotting activity addressed more
messages to the Radio net than previously and most of these sent for information to the Major
Commanders. Much traffic also was
directed to NRE0 (the TOKYO D. F. Command) from all eight stations in the Mandates and OMINATO. This Command
also originated messages of high
precedence to the Major Fleet Commanders. This activity is interpreted to indicate that the R. I. net is
operating at full strength upon U. S.
Naval Communications and IS GETTING RESULTS. TOKYO originators were active with messages of high precedence to the Commander in Chiefs of the Second and Third
Fleets and Combined Air Force. The Navy
Minister sent to Alnavs. The Chief of the Naval General Staff sent one to the Chief of Staffs of
Combined Air Force, Combined Fleet,
Fourth Fleet, Third Fleet, French Indo-China Force, Second Fleet and RNO PALAO. The BUAERO sent one to Chief
of Staff Fourth Fleet info IMIESI and
11th Air Corps at SAIPAN.
Combined Fleet.-No indication of movement of any Combined Fleet units. Commander in Chief Second Fleet originated
his usual number of dispatches to Third
Fleet and Combined Air Force. The units paid particular attention to by the Commander in Chief Second Fleet
were CARDIVS Five and Seven and DESRONS Two and Four and SUBRON Five. No
traffic today from the TAKAO (CA).
Third Fleet.-Little activity from Third Fleet units save for the Commander in Chief. The impression is growing
that the First Base Force is not
present with the bulk of the Third Fleet in SASEBO but it is not yet located elsewhere. The Army Commander in
TAIHOKU is still holding communications
with the commander in Chief Third Fleet. Two Third Fleet units arrived at BAKO and are apparently
returning to KURE from BAKO.
Fourth Fleet.-Bulk of Fourth Fleet still at TRUK. The Commander in
Chief Fourth addressed message to the
Sixth Base Force at JALUIT and the Fourth
Base Force at TRUK. Yokohama Air Corps is at RUOTTO and WOTJE and held communications with AIRRON Twenty-Four
Sixth China.-SAMA sent several messages to shore addresses in the Empire. SAMA also addressed the OMURA AIR
CORPS in several messages which went
for information to SAIGON and TOKYO. TAKAO radio station addressed the Chiefs of Staff Combined Fleet,
Second Fleet, the French Indo China
Force and Combined Air Force. TAKAO Air Corps addressed SUKUGAWA Air Corps and YOKOSUKA Air Corps. A
representative of a HAINAN office now
at SAIGON originated several messages to the Naval Bases at SASEBO and KURE. The Commander in Chief China
Fleet originated more traffic than
usual and addressed his fleet collectively for information to the Commander in Chief Second and
Commander in Chief Third Fleets.
Submarines.-Except for the mention of SUBRONS Five and Six in two dispatches there was no submarine activity
(FROM: U.S. CONGRESS JOINT COMMITTEE ON PEARL
HARBOR ATTACK HEARINGS; PT. 35, THE
CLAUSEN INVESTIGATION, PP. 62-81. EXHIBIT "A" DAILY COMMUNICATION