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More like this: air force, walk the lines and firearms.

Public notices with citations

Signs and notices that have citations to statutes, regulations, local codes, and other such stuff.

Federal Plaza, Chicago, 1986. I'm hoping there's a prize category for oldest pic.

No Firearms or Weapons Allowed

Use of deadly force authorized

Yes, it's regulated.

A guy with a sign, and a cause.

Hiking (thanks, Janet!)

Code of Federal Regulations