I received the September issue of the ISSA Journal. It contains several useful articles, with the most helpful to me being a humanly readable summary of the Common Criteria by Alex Ragen. I don't think Mr. Ragen clearly states who needs to purchase Common Criteria-validated products however.
His article's first sentence states:
"On July 1, 2002, the US Department of Defense began to enforce National Security Telecommunications and Information Systems Security Policy (NSTISSP) #11 (issued in January 2000), which mandates that US government agencies purchase only those IT security products which have been validated in accordance with Common Criteria and/or FIPS 140-1 or FIPS 140-2 as appropriate."
He also says:
"As mentioned earlier, US government agencies now require Common Criteria certification."
This is not true. According to the Committee on National Security Systems FAQ:
"The policy mandates, effective 1 July 2002, that departments and agencies within the Executive Branch shall acquire, for use on national security systems, only those COTS products or cryptographic modules that have been validated with the International Common Criteria for Information Technology Security Evaluation, the National Information Assurance Partnership (NIAP) Common Criteria Evaluation and Validation Scheme (CCEVS), or by the National Institute of Standards and Technology (NIST) Federal Information Processing Standards (FIPS) Cryptographic Module Validation Program.
Additionally, subject to policy and guidance for non-national security systems, NSTISSP # 11 notes that departments and agencies may wish to consider the acquisition of validated COTS products for use in information systems that may be associated with the operation of critical infrastructures as defined in the Presidential Decision Directive on Critical Infrastructure Protection (PDD-63)." [emphasis added]
Those bold sections make all the difference. This means that systems operated by the Department of Commerce, for example, that are not "national security systems," do not have to be validated by the Common Criteria. While some people discuss the possibility that Common Criteria would be extended beyong NSS, there is definitely no mandate to do so.