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).
The transition to a clean energy future and diversified sources of energy requires a fundamental shift in how we produce and consume energy across all sectors of the U.S. economy.
A deeper understanding of methane could help scientists better address these impacts – including potentially through methane removal.
While it is reasonable for governments to keep the most sensitive aspects of nuclear policies secret, the rights of their citizens to have access to general knowledge about these issues is equally valid so they may know about the consequences to themselves and their country.
Advancing the U.S. leadership in emerging biotechnology is a strategic imperative, one that will shape regional development within the U.S., economic competitiveness abroad, and our national security for decades to come.