US Department of Defense
The Navy organization, the Deputy Assistant Secretary of the Navy for Acquisition Management, DASN (ACQ), successfully achieved certification and accreditation for the One Source website. The site is deployed on the Pentagon's network infrastructure hosted by the United States Army Information Technology Agency (USAITA).
The DASN (ACQ) One Source web site is a system comprising open-source software that is based on eZ Publish, known as a robust, highly customizable content management framework.
All details about the DoD Certification process : http://share.ez.no/articles/ez-publish/us-department-of-defense-information-assurance-achieving-successful-ditscap-with-ez-publish-as-a-platform