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This is an in camera affidavit by Eugene F. Yeates, Chief of the National Security Agency's Office of Policy, sworn in October 1980 in the case Citizens Against Unidentified Flying Objects Secrecy v. NSA, Civil Action No. 80-1562. It says NSA located 239 documents and explains why it withheld 156 communications intelligence reports produced between 1958 and 1979. It also explains the deletions in two released staff papers. The affidavit concludes that disclosure would reveal intelligence sources and methods, so the records are exempt under FOIA.
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b. Two of these COMINT reports originated from SIGINT operations which
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Document, from the nsa collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 21 pages are in the text index: search them above, or from the library's search.