[144] COMMUNICATION INTELLIGENCE SUMMARY, 8
November 1941
General.-Normal volume of intercepted traffic with no
"dummies" appearing on the
UTU. All UTU traffic was broadcast to the general call only. The Staff Communication Officer of the
French Indo-China Force (So. Exp. For.)
sent a dispatch *action* to S. C. O. Combined INFO. S. C. O. Second Fleet, Combined Air Force,
unidentified fleet unit, Radio stations
at Tokyo, Palao and Takao. This may indicate a contemplated coordination of communications between the
Indo-China-South China areas and the
Palao Island-Taiwan area. Secret calls were used very little as compared to the past few days and only three
circuits were heard using them,
including the Combined Fleet Commanders circuit and Air Station Net. North Japan-Ominato circuits were quiet.
All mandate circuits were active, with
heavy interchange of traffic involving all classes of Mandate addressees in all areas, but with
continued emphasis on the Palao area at
one end d the Jaluit-Marshall area on the other. Chichijima Air Station was included much of the traffic between
Empire Offices and Saipan Air with
Jaluit Base Force included for information. Inclusion of Chichijima usually presages an air movement between Mandates and Empire but the Units involved
are unidentified. Commander of
unidentified shore activity (NEO 66) previously associated with the Fifth Fleet, was addressed at Chichijima Air
which tentatively identifies him an air
activity. Previous association of the Fifth Fleet traffic with Fourth Fleet and Yokosuka tends to confirm the belief
that Fifth Fleet operations are, or
will be, in the area adjacent to Chichijima-Marcus,
supplementing the Fourth Fleet in the lower island areas.
Fleet.-Chief of staff First Fleet originated a dispatch through Kure Radio. Batdiv Three of the First Fleet
appears to be operating separately from
the main force, possibly in connection with Cardivs Three and Four in the Taiwan-Naha ea. An apparent movement report
from Cardiv Four was addressed to CinC
Combined Fleet, First Fleet, CarDiv Commander,
Combined Air Force Commander d to movement offices at Tokyo, Yokosuka, Kure, Maizuru, and Sasebo. Traffic
from the Commander Indo- China Force is handled from the Japanese radio station
Saigon rather than from the KASHII,
indicating that the staff is based ashore present. No identifiable submarine activity was noted.
Air.-Takao and Mandates continue to be the center of air activities.
The area between Chichijima, Naha,
Takao, Palao and Jaluit appears to-be particularly
concerned with movement of air forces and auxiliaries, while the formation of force under Combined
Air Commander in the Takao- Bako area appears to be nearly completed as
indicated by reports addressed to CinC.
Combined, Naval Minister, Commanders of CarDivs, Combined Air Force, First [145] Fleet and shore addresses
generally associated with movements or
organization changes. This force is believed
to include CarDiv Four, and possibly CarDiv Three, with a number of auxiliaries and units of the
Combined Air Force, also possibly some
its from the First Fleet. Lack of identification renders composition of the force highly speculative
and area of operations obscure. Prior
to change of calls, much traffic was exchanged between China, South China and Indo-China while at
present most traffic includes Palao.
(FROM: U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR
ATTACK HEARINGS; PT. 35, THE CLAUSEN
INVESTIGATION, PP. 62-81. EXHIBIT "A" DAILY COMMUNICATION
INTELLIGENCE SUMMARIES)