COMMUNICATION INTELLIGENCE SUMMARY, 1
General.-Traffic volume a little less than normal, receiving conditions
fair but a traffic rather slow. The
first day’s yield of new calls not very
great. Fleet calls only changed, shore station calls and shore addresses not changed. It is believed that
tactical calls also remain unchanged
but not enough intercepted traffic to so state definitely. The same garble table for calls is employed so
the change amounts to a reassignment of
calls previously used. New calls have appeared but it is thought that they were formerly assigned to
obscure units or were in reserve. All
of the major Fleet calls are identified and a small amount of individual calls were recovered today.
Because the new calls are not yet lined
up save for the major Fleet Commanders and all time today was spent in call recovery, this summary will
deal only with general impressions.
Combined Fleet.-The FIRST FLEET was not very active today in radio traffic. The CINC SECOND FLEET appears to
have originated quite a bit of traffic
to addresses placed in submarine and carrier category. No indications of movement of any of these
units. COMBINED FLEET tactical circuits
were heard but little tactical traffic copied due to interference by NPM.
Carriers-The COMMANDER CARDIVS was mentioned in dispatches from Tokyo and he took a fair amount of traffic on the
Submarines.-Nothing to report. Calls of the Submarine Fleet not well lined up yet.
Third Fleet.-This Fleet very active as before. The SECOND and FIRST
BASE FORCEs are still marshaling their
MARUs and the CINC is very busy with Tokyo.
China.-The activity of HAINAN BASE continues. The KASHII sent several messages from Saigon.
U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR ATTACK HEARINGS; PT. 35, THE CLAUSEN INVESTIGATION, PP. 62-81.
EXHIBIT "A" DAILY COMMUNICATION INTELLIGENCE SUMMARIES)