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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.
Read from the scan by GLM-OCR; expect the odd misread word.
for the target communicators the specific communications that had been intercepted and exploited. One hundred and fifty-four of the CONINT reports being withheld are the product of intercept operations directed against foreign government controlled communications systems within their territorial boundaries. Revealing the contents of these reports would disclose the capability of NSA to target these government controlled communication systems. Even where the underlying communications are not specified, had been intercepted for processing by NSA. Moreover, the disclosure of these reports would reveal much more than the identity of the targeted communications systems. It would reveal as well 11. (TS-020) The communications sources involved in this case -- which are specified or implicitly identified in the COMINT reports being withheld by NSA -- are the source of extremely valuable communications intelligence covering a broad range of kinds of information from [and other] activities to [and] matters. Release of these documents would seriously damage the ability of the United States to gather this vital intelligence information for the following reasons: a) Disclosure of the report discussed in paragraph 9b would inform [that their communications by international common carrier facilities] [can be intercepted and selected out by NSA, and, even more importantly, that the]
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Document, from the nsa collection. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 21 pages are in the text index: search them above, or from the library's search.