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https://files.mastodon.social/media_attachments/files/004/321/886/original/a5aff0a2269ebe2f.jpe
NSA security/motivational posters from the 1950s and 1960s http://www.governmentattic.org/28docs/NSAsecurityPosters_1950s-60s.pdf (PDF) #opsec #vintage https://t.co/YXfRNgzhUC
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