List of Old NSA Training Videos
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List of Old NSA Training Videos - Schneier on Security
https://www.schneier.com/blog/archives/2024/09/list-of-old-nsa-training-videos.html
The NSA’s “National Cryptographic School Television Catalogue (pdf)” from 1991 lists about 600 COMSEC and SIGINT training videos.
There are a bunch explaining the operations of various cryptographic equipment, and a few code words I have never heard of before.