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Declassification Guide

A guide providing classification and declassification instructions specifically for information that is 25 years old or older and of permanent historical value. A Declassification Guide is also the most commonly used vehicle for obtaining Interagency Security Classification Appeals Panel (ISCAP) approval of 25-year exemptions from the automatic declassification provisions of Executive Order (EO) 13526, “Classified National Security Information,” as amended.