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SIS

Short for
  1. Swedish Standards Institute[?] (since they were earlier named Standardiseringskommissionen i Sverige).
  2. Schengen Information System.
  3. Secret Intelligence Service.
  4. Signals Intelligence Service[?]. This US Army Group, led by William
Friedmann, broke the Japanese Foreign Office cypher called Purple. It became, eventually, a part of the NSA.



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