TheCodeBreakers
were attempting in the Atlantic, and, as with the U-boats, cryptanalysis
helped them achieve their greatest successes.
il
A direct line led from FRUPAC to the office of Captain R. G. Voge,
operations officer of the Commander, Submarines Pacific Fleet. The
Japanese convoys radioed the positions where they estimated they would
be as of noon on the next few days. This was to inform their own forces of
their locations, but FRUPAC solved the messages, and Jasper Holmes, an
ex-submariner himself, relayed them to Voge, who broadcast them to the
American submarines. This fattened their kill. Vice Admiral Charles A.
Lockwood, Jr., who was COMSUBPAC during most of the war, estimated
that cryptanalytic information stepped up American sinkings by about
one third on the trade routes to the Philippines and the Marianas.
Eventually the submarine commanders received it so regularly that they
complained if a convoy reached its noon position half an hour late!
annaabi.ee 
