Which publication provides complete details on the priority destruction of keymat?

The correct answer is the publication that specifically addresses the priorities and procedures for the destruction of keymat, which is critical in maintaining national security and the protection of classified materials. The CMS 1 publication outlines detailed guidelines for managing and handling keymat, including destruction protocols. It provides comprehensive instructions on how to ensure these sensitive materials are rendered unusable to prevent unauthorized access or use.

CMS 25MC, DOI 55, and AR 380-53 do not focus exclusively on this specific aspect of keymat destruction, which is why they are not the best references for understanding the importance and methods associated with the priority destruction of keymat. Instead, these publications cover other relevant areas of security and material handling but do not delve into the specific procedures that CMS 1 provides regarding keymat. Understanding the content of CMS 1 is crucial for personnel involved in the handling and disposal of critical materials to comply with regulatory standards and national security protocols.