NSA rare posters (part 1)
In the 1950s and 1960s the National Security Agency (NSA) cranked out beautiful and captivating posters to remind Americans that keeping secrets was important. These declassified posters were unearthed by Government Attic, via its use of the Freedom of Information Act. Funded by the taxpayer, these vintage NSA security posters from the 1950s and 1960s are in the public domain.
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