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Officer in charge of Station Hypo
- In early 1941, Laurance Safford, again chief of OP-20-G in Washington, sent Rochefort to Hawaii to become officer in charge of Station Hypo ("H" for Hawaii in the Navy's phonetic alphabet at the time) in Pearl Harbor as Rochefort was an expert Japanese linguist and trained cryptanalyst.
en.wikipedia.org/wiki/Joseph_Rochefort
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In early 1941, Laurance Safford, again chief of OP-20-G in Washington, sent Rochefort to Hawaii to become officer in charge of Station Hypo ("H" for Hawaii in the Navy's phonetic alphabet at the time) in Pearl Harbor as Rochefort was an expert Japanese linguist and trained cryptanalyst.
Rochefort used his cryptologic and linguistic skills to help crack the top Japanese Naval Code (JN-25) with his team of code-breakers, linguists, and radio traffic analysts—all located at the...
In early 1941, Laurance Safford, again chief of OP-20-G in Washington, sent Rochefort to Hawaii to become Officer in Charge (OIC) of Station Hypo in Pearl Harbor. The reasons for Rochefort's appointment were obvious: he was an expert Japanese linguist, an experienced and very talented intelligence analyst, and a trained cryptanalyst.
Elliot Carlson’s Joe Rochefort’s War: The Odyssey of the Codebreaker Who Outwitted Yamamoto at Midway is a literary masterpiece. This is a long overdue biography of an individual who helped shape the events of the Pacific War following Japan’s raid on Pearl Harbor.
- 'AF' Identified as Code For Midway
- Codebreakers Set A Trap to Confirm Japanese Attack
- Us Victory at Battle of Midway Marks Turning Point in WWII
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.” Station Hypo had little doubt as to what “AF” referred to: the U.S...
Rather than accept Midway as the target, Redman and others in Washington suspected the Japanese might be preparing another attack in the South Pacific, against Port Moseby, New Caledonia or Fiji, or even an attack on Hawaii or the U.S. West Coast. Determined to dispel such doubts, Rochefort’s team famously devised a ruse. Via submarine, they sent a...
Code-breaking alone doesn’t explain the stunning Allied victory in the Battle of Midway (June 4-7, 1942), according to Symonds. But, he says, it does explain why “American decision-makers, and particularly Chester Nimitz, knew enough to take what at the time seemed to many to be a risky move—committing all three of his existing aircraft carriers, i...
- Sarah Pruitt
- 15 min
Dec 8, 2011 · Rochefort, responsible for the Pacific Fleet's radio intelligence unit at the time of the Pearl Harbor attack, felt immense guilt at his failure to predict it. His work deciphering codes over the...
Apr 23, 2012 · During early 1942, a cell of colorful, oddball radio intelligence specialists in a dingy basement at Pearl Harbor labors to break the Imperial Japanese Navy’s coded messages. Led by Commander Joseph Rochefort, often attired in a smoking jacket and slippers, they succeed brilliantly.
