32 C.F.R. § 1802.12
The challenge shall include identification of the challenger by full name and title of position, verification of security clearance or other basis of authority, and an identification of the documents or portions of documents or information at issue. The challenge shall also, in detailed and factual terms, identify and describe the reasons why it is believed that the information is not protected by one or more of the § 1.5 provisions, that the release of the information would not cause damage to the national security, or that the information should be declassified due to the passage of time. The challenge must be properly classified; in this regard, until the challenge is decided, the authorized holder must treat the challenge, the information being challenged, and any related or explanatory information as classified at the same level as the current classification of the information in dispute.
32 C.F.R. §1802.12