TheCodeBreakers
The first batch of
recruits—60 of them—were
drawn form foreign-language schools and commercial colleges to
become the first civilians in the Tokumu Han. The second batch
consisted of about 70 reserve officer candidates selected from about 500
in basic training on the basis of their competence in foreign languages.
(These signal intelligence groups differed from classes learning
cryptography.) During a five-month course at the Naval Communication
School at Kurihama near Yokosuka— hard by the Commodore Matthew
Perry monument—they practiced International Morse, studied the
elementary Oriental Tenji and Tenchi ciphers as well as the Occident's
more advanced Porta and Vigenere, and learned how to break codes and
ciphers. Six classes, each larger than its predecessor, were trained
during the war. Some graduates were assigned to communications
intelligence in the intelligence units of fleet and force headquarters. In
annaabi.ee 
