If you were walking around the National Security Agency during the 1950s and 60s, you may have been repeatedly told through wall posters that “security is everyone’s responsibility.”

The signals intelligence agency commonly known during that time as “No Such Agency” really didn’t want employees talking about what they did for work, according to a recently published trove of posters from the website Government Attic, which mines the U.S. government for interesting documents via Freedom of Information Act requests.

Some of my favorites are below, but you can check out the full 139-page archive here.

NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic
NSA postersNational Security Agency/FOIA/Government Attic

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