TheCodeBreakers
between the Anglo-Saxon nations and Japan through some clash of arms
and add that the time of the breaking out of this war may come quicker
than anyone dreams." Both these messages were translated on December
1, and Roosevelt considered the latter so important that he asked for a
copy of it to keep. Kramer, after paraphrasing it for security's sake, gave
him one.
At Pearl Harbor, Rochefort had just been presented with an
unpleasant confirmation of that tautening situation. The Japanese fleet
reassigned its 20,000 radio call-signs at midnight, December 1—only 30
days after the previous change. It was the first time in Rochefort's
experience that a switch had occurred so soon after a previous one.
The one on November 1 had been expected; it had followed by the
usual six months the regular spring call-sign shift. With the facility born
of long experience, Rochefort's Combat Intelligence Unit identified in
annaabi.ee 
