Communication Intelligence Summary. 20-21
General.-Traffic volume for past two days has been higher than normal. Tokyo originators active with messages
addressed to all major commanders. N.
G. S. sent a UNI WIWI to Commandant BAKO for information to Chief of Staff South China Fleet and
Canton. The Personnel Bureau at Tokyo
become very active on the 21st sending out a series of long personnel messages. The activity at Tokyo
identified as R. D. F. plotting
stations increased his recent high volume of messages with a long four part message addressed to all major
commanders. He also addressed several
dispatches to the Direction Finder net, indicating the employment and results being obtained by this
activity. The traffic load on the Tokyo-Takao
circuit was very heavy on the 21st, so heavy that be circuit was in duplex operation most of the mid-watch.
Combined Fleet.-Flags of both First and Second Fleets are in Kure area and most of both fleets remain in Kure-Sasebo
area. Battleship Division Three still
in Yokosuka area. Traffic to and from the CinC. Second Fleet continues abnormally high. A list of units
addressed by him or who sent traffic to
him and CinC. Third Fleet over the past two days follows:
MIRA 9 (Carrier Division Three), ENO 7 (Unidentified), TAE 1 (Airron 7),
AKU 8 (Air Unit), KAME 5 (Airron 6), KUSU 7 (Unidentified), YAWI (Crudiv 5), SATU
88 (Unidentified), KENU 3 (Crudiv 7), KUNI 88 (Unidentified), RESE 4 (Desron 3),
OYU 9 (Unidentified), AKI 0 (Desron 4), KONA 0 (Unidentified), TIYA 7 (Comdr. 1st
Base For), NOTU 6 (Unidentified), SASE 3 (Comdr. 2nd Base For), NETE 5 (Unidentified),
YOMO 9 (Desron 5), NSI 3 (Unidentified), REA 2 (Shiogama Air Corps), SUTE 1 (Unidentified),
KUNO 9 (Erimo), YAYU 1 (Unidentified), MIMO 3 (Air Unit ?), MARE 5 (Unidentified),
TUE 7 (Unidentified), Plus 11 Marus.
This list is not the complete estimate of forces being assembled by him
but only the ones occurring in the past
two days. Each one appeared not only
with the CinC. Second Fleet but with the Third Fleet and with one of the units now in South China or
Taiwan-South China Address. A complete
list is being made up but was not finished at this writing. Assuming that the entire Second Fleet will be
included in this organization and that
each unit addressed will either participate or contribute somewhat to the Task Force it appears that it will
comprise a good portion of the navy.
One item stands out-so far there has been practically no submarine units mentioned by the Second or Third
Fleets in connection with South China
activities. Commander Submarine Force has not been included in traffic. He does appear in Tokyo Fourth Fleet
and Mandates traffic.
(FROM: U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR
ATTACK HEARINGS; PT. 35, THE CLAUSEN
INVESTIGATION, PP. 62-81. EXHIBIT "A" DAILY COMMUNICATION