Classification Guide for SIGINT Material Dating from 16 August 1945 - 31 December 1967
Document Date:
December 21, 2011
Release Date: June 18, 2014
Agency:
Press
Document Type:
Internal NSA Documents/Presentations
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Schedule for different categories of classification to be adopted for Signals Intelligence (SIGINT), which comprises information obtained through electronic surveillance, between August 1945 and December 1967.