[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)