From Secrecy News:
MARINE CORPS: EXPOSE YOURSELF TO SECRECY NEWS
U.S. Marine Corps personnel who are responsible for protecting classified information should consult a variety of sources including Secrecy News in order to maintain their professional awareness, a new Marine Corps newsletter advised (pdf).
To begin with, "you should read every security-related regulation/article you can get your hands on," including the executive order on classification, the Information Security Oversight Office implementing directive, and so forth.
Then the newsletter recommended "exposing yourself to opposing views over the proper protection of CMI [classified military information]," a category that it said includes the views of Secrecy News and the National Security Archive.
See "Security Standard," the official newsletter of the MARFORPAC [U.S. Marine Corps Forces Pacific] Command Security Branch, January 2009, page 1.
The newsletter is marked "For Official Use Only."