The Information Security Oversight Office has published an expanded guide explaining how to properly mark classified documents. See “Marking Classified National Security Information” (pdf), October 2007.
A 1972 monograph prepared at the National Archives reviews the history of information control markings on military documents back to the 19th century and traces their development up to World War II. Such markings represent part of the pre-history of today’s national security classification system.
See “Origins of Defense-Information Markings in the Army and Former War Department” (pdf) by Dallas Irvine, National Archives Staff Information Paper, 1972.
A sizable collection of old military regulations relating to protection of confidential information is presented in a series of annexes to the paper (pdf).
With summer 2025 in the rearview mirror, we’re taking a look back to see how federal actions impacted heat preparedness and response on the ground, what’s still changing, and what the road ahead looks like for heat resilience.
Satellite imagery of RAF Lakenheath reveals new construction of a security perimeter around ten protective aircraft shelters in the designated nuclear area, the latest measure in a series of upgrades as the base prepares for the ability to store U.S. nuclear weapons.
It will take consistent leadership and action to navigate the complex dangers in the region and to avoid what many analysts considered to be an increasingly possible outcome, a nuclear conflict in East Asia.
Getting into a shutdown is the easy part, getting out is much harder. Both sides will be looking to pin responsibility on each other, and the court of public opinion will have a major role to play as to who has the most leverage for getting us out.