Communication Intelligence Summary,
December 6, 1941
General.-Traffic volume very heavy with a great deal of old traffic being transmitted. Messages as far back as 1
December were seen in the traffic. This
not believed an attempt to maintain a high traffic level but is the result of confusion in traffic
routing with uncertainty of delivery.
The stations now holding broadcasts are TOKYO (with 3 distinct and separate broadcasts), SAIPAN, OMINATO and
Yesterday's high level of traffic from TOKYO originators was maintained
with the Intelligence activity still
sending periodic messages. Practically
all of TOKYO's messages carry prefixes of high priority.
Combined Fleet.-Still no traffic from the Second and Third Fleet Commanders. These units are sending their
traffic via the TAKAO and TOKYO
broadcasts. The Commander in Chief Combined Fleet originated several messages to the Carriers, Fourth
Fleet and the Major Commanders.
Fourth Fleet.-The Commander in Chief Fourth Fleet is again in the TRUK area. It is doubtful that he ever went to
JALUIT although it is certain that some
members of his staff were there over the past few days. There is a definite close association between the
Third Base Force at PALAO and the forces
in South China. This unit is constantly sending messages to the Chief of Staff the Second Fleet, Third
Fleet, Indo-China Forces and BAKO. It
is being almost entirely neglected by Commander in Chief Fourth Fleet under whose command it normally
operates. RONGELAB radio addressed the
PALAO weather observer.
Fifth Fleet.-This fleet appears dispersed about the JAPAN Sea with OMINATO broadcasting traffic for this unit.
Submarines.-The Commander Submarine Force originated two messages to
his command. These are the first two
originated since 1 December. He is definitely
in the MARSHALLS.
South China.-Nothing new to report. BAKO, SAMA and TAKAO still sending many messages to the Task Force.
U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR ATTACK HEARINGS; PT. 35, THE CLAUSEN INVESTIGATION, PP. 62-81.
EXHIBIT "A" DAILY COMMUNICATION INTELLIGENCE SUMMARIES)