TheCodeBreakers
Rochefort had primary responsibility for the Japanese naval systems.
The Philippines chipped away at JN25 and did some diplomatic
deciphering, with keys provided by Washington. That unit, which like
Rochefort's was attached for administrative purposes to the local naval
district (the 16th), was installed in a tunnel of the island fortress of
Corregidor. It was equipped with 26 radio receivers, apparatus for
intercepting both high- and low-speed transmissions, a directionfinder,
and tabulating machinery. Lieutenant Rudolph J. Fabian, 33, an
Annapolis graduate who had had three years of radio intelligence
experience in Washington and the Philippines, commanded. The 7
officers and 19 men in his cryptanalytic group exchanged possible
recoveries of JN25b codegroups with Washington and with a British
group in Singapore; each group also had a liaison man with the other.
Of the Navy's total radio-intelligence establishment of about 700
annaabi.ee 
