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DOD DIRECTIVE 5200.30, GUIDELINES FOR SYSTEMATIC DECLASSIFICATION REVIEW OF CLASSIFIED INFORMATION IN PERMANENTLY VALUABLE DOD RECORDS, MARCH 21, 1983
sometimes followed by five-letter codewords (World War II's ULTRA, for example) and often carrying ... of any electronic equipment. 8. Torpedo information as follows: a. Torpedo countermeasures devices: T-MK6 (FANFARE) ...