This regulation implements the policy set forth in Executive Order 12958 "Classified National Security Information" and DOD 5200.1-R "Information Security Program." It establishes policy for classification, downgrading, declassification, and safeguarding of information requiring protection in the interest of national security. This regulation applies to all military and civilian members of the Active Army, Army National Guard of the United States (ARNGUS), and US Army Reserve (USAR), and Department of the Army (DA) personnel.