“The Defense Information Systems Agency has been tapped to tighten up network security of all branches of the federal government except the State Department and the FBI, which have their own systems. The move is in response to the unauthorized release of hundreds of thousands of pages of Pentagon and State classified documents in 2010 and 2011 by the website WikiLeaks, the agency said.”
Source:DISA charged with securing networks for all but two agencies – Nextgov.com