[165]   Communication Intelligence Summary, 25 November, 1941
 
General.-Traffic volume normal. Receiving conditions much improved over  last two days. Tokyo personnel bureau active with messages to various  units. Tokyo originated one UNI WIWI to CinC. Combined Fleet, CinC.  Second Fleet CinC. Third Fleet, CinC. Fourth Fleet and CinC. French,  Indo China Force plus Yokosuka, Kure and Maizuru. The Navy Minister  originated several AlNavs. A Direction Finder Net, controlled by Tokyo  radio was active with secret calls being sent by the five stations. The  entire fleet traffic level is still high which leads to the conclusion  that organizational arrangements or other preparations are not yet  complete.
Combined Fleet.-Little activity by CinC. First Fleet. CinC. Second Fleet  remains highly active as an originator, addressing Third Fleet, Air  Forces and South China units. A Second Fleet unit and a submarine  division or squadron arrived in Takao communication zone today.  Crudivision Seven which previously arrived there has been associated  with Destroyer Squadron Three which indicates the presence of that unit  in Takao vicinity. Palao and Second Fleet still exchanging messages. Two  new units to be associated with CinC Second Fleet and the Task Force now  forming are the North China Fleet and Defense Division One.
Air.-Through the identification of a call made today Genzan Air Corps  has been in Saigon since the eighteenth. We believe that other units of  the Combined Air Force have moved from Taiwan to the French Indo China  Area although this is not yet verified. One or more of the Carrier  Divisions are present in the Mandates.
Fourth Fleet.-CinC. Fourth Fleet is still holding extensive  communications with the Commander Submarine Fleet, the forces at Jaluit  and Commander Carriers. His other communications are with the Third,  Fourth and Fifth Base Forces.

 

(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)