[175]   Communication Intelligence Summary, 3 December 1941
 
General.-Traffic volume normal with receiving conditions good. Present  state of call recovery does not permit much detailed information to be  obtained. The extensive use of alternate calls by the major commands  slows up identification of even these Units. Very few units have been  positively identified so far. The Chief of the Naval General Staff  originated three long dispatches to the CINC COMBINED, SECOND and THIRD  FLEETS. The Tokyo Intelligence originated nine dispatches to the same  addresses.
The presence of the CINC SECOND FLEET in Taiwan waters is not revealed  by radio traffic. In some traffic from Takao the CINC SECOND FLEET is  indicated as having previously received the messages while in others to  Tokyo he is indicated for delivery by that station. It is the impression  that both SECOND and THIRD FLEETS are underway but are not verified by  Radio Intelligence means.
There are some FOURTH FLEET Units in the Marshall Islands area including  some of the FOURTH FLEET Staff. The identity of these units is not  known. The SIXTH BASE FORCE at Jaluit addressed several messages to CINC  FOURTH.
Some Swatow Units were addressed at Saigon today indicating a movement  of some South China Units to Saigon. Bako originated many dispatches to  the RNO Taihoku and the Task Force Commander.
No information on submarines or Carriers.
 
(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)