A new report from the National Security Archive shows the Pentagon has recently tried to cover up historical information that was declassified and released to the public years ago.

From NSA’s report, “More Dubious Secrets”:

Pentagon classification authorities are treating classified historical documents as if they contain today’s secrets, rather than decades-old information that has not been secret for years. Today the National Security Archive posted multiple versions of the same documents—on issues ranging from the 1973 October War to anti-ballistic missiles, strategic arms control, and U.S. policy toward China—that are already declassified and in the public domain. What earlier declassification reviewers released in full, sometimes years ago, Pentagon reviewers have more recently excised, sometimes massively. The overclassification highlighted by these examples poses a major problem that should be addressed by the ongoing review of national security information policy that President Obama ordered on May 27, 2009.

For example, two different versions of a 1969 memo—the first released in 1989 and the second in 2008—show the Pentagon is trying to cover up more information now than it was twenty years ago:

The National Security Archive is an independent non-governmental research institute and library located at The George Washington University, the Archive collects and publishes declassified documents obtained through the Freedom of Information Act.

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Carrie Ching is an award-winning, independent multimedia journalist and producer based in the San Francisco Bay Area. For six years, she led digital storytelling projects at the Center for Investigative Reporting as senior multimedia producer. Her multimedia reports have been featured by NPR.org, The Huffington Post, Rolling Stone, Grist, Time.com, Fast Company, the Los Angeles Times, The Washington Post, KQED, PBS NewsHour, Salon.com, Mother Jones, Public Radio International, Poynter, Columbia Journalism Review and many other publications. Her specialty is crafting digital narratives and exploring ways to use video, audio, photography, animation and interactive graphics to push the boundaries of storytelling on the Web, tablets and mobile. Her work has been honored with awards from the Society of Professional Journalists, Investigative Reporters and Editors, Best of the West, the Online News Association, Scripps Howard, The Gracies, and was part of the entry in a Pulitzer-finalist project. Prior to her time at CIR she was a magazine and book editor, video journalist, newspaper reporter and TV comedy scriptwriter. She was on the 2010 Eddie Adams Workshop faculty as a multimedia producer working with MediaStorm to teach digital storytelling techniques to photojournalists. She completed a master’s degree in journalism at UC Berkeley in 2005.