U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 28, 2025

All TitlesTitle 28Chapter IPart 17Subpart B - Subpart B—Classified Information
§ 17.21 - Classification and declassification authority.
§ 17.22 - Classification of information; limitations.
§ 17.23 - Emergency classification requests.
§ 17.24 - Duration of classification.
§ 17.25 - Identification and markings.
§ 17.26 - Derivative classification.
§ 17.27 - Declassification and downgrading.
§ 17.28 - Automatic declassification.
§ 17.29 - Documents of permanent historical value.
§ 17.30 - Classification challenges.
§ 17.31 - Mandatory review for declassification requests.
§ 17.32 - Notification of classification changes.
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