TheCodeBreakers
based on radio intelligence from the field units, and GL, a record-keeping
and historical-research group. But its main interest centered on
cryptanalysis.
This activity was distributed among units in Washington, Hawaii, and
the Philippines. Only Washington attacked foreign diplomatic systems
and naval codes used in the Atlantic theater (primarily German).
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
annaabi.ee 
