U.S. Air Force Controlled Area high security military installations
Key Details & Legal Authority
- Legal Basis: The sign cites 50 U.S.C. 797 (Section 21 of the Internal Security Act of 1950), which gives the Department of Defense the authority to regulate entry and conduct on military properties. Entering such an area without permission is a federal offense.
- Search Authority: The text explicitly warns that all personnel and property within the installation are subject to search, a standard security protocol for controlled military zones.
- Form Number: The bottom left corner identifies this as AF FORM 3550 (dated Oct 81), which is the official Air Force design template for this specific security sign.
Cultural Significance
While used across many bases, this particular sign design is famously associated with the perimeter of Area 51 (Groom Lake) in Nevada. Because of this connection, authentic-looking reproductions are popular among collectors and enthusiasts of military history or UFO lore.
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