The Defense Information Systems Agency (DISA) was originally established as the Defense Communication Agency (DCA) within the Department of Defense by direction of the Secretary of Defense on May 12, 1960. The DCA was renamed Defense Information Systems Agency by DoD Directive 5105.19 of June 25, 1991. DISA is a combat support agency comprised of military, federal civilian, and contractor partners. DISA engineers and provides command and control capabilities and enterprise infrastructure to continuously operate and assure a global net-centric enterprise in direct support to joint warfighters, National level leaders, and other mission and coalition partners across the full spectrum of operations. (Source: http://www.disa.mil/)
A component of Defense Department.