![]() ![]() Redman, director of OP-20-G, the Navy’s Code and Signals Section. Officially, Rochefort reported to Captain John R. “Rochefort’s job was to gather information, raw data for the most part, and send to Washington,” says Craig Symonds, professor of maritime history at the Naval War College and author of The Battle of Midway. Back in March, a Japanese plane reporting weather conditions near the islands had also mentioned “AF,” suggesting strongly that the designator referred to Midway.īut not everyone was convinced the codebreakers were right. ![]() naval and air base on Midway Atoll, two tiny islands located in the central Pacific, around 1,200 miles northwest of Pearl Harbor. Station Hypo had little doubt as to what “AF” referred to: the U.S. The radio traffic they intercepted that May suggested that Admiral Isoroku Yamamoto, the mastermind behind the Pearl Harbor attack, was preparing a major invasion, involving four Japanese aircraft carriers along with many other ships, at a location designated with the initials “AF.” Navy's cryptologic and intelligence developments from 1925 to 1947. ![]() Captain Joseph John Rochefort was a major figure in the U.S. ![]()
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