Source : WordNet®

Defense Information Systems Agency
     n : a combat support agency in the Department of Defense
         responsible for developing and operating and supporting
         information systems to serve the needs of the President
         and the Secretary of Defense and the Joint Chiefs of
         Staff [syn: {DISA}]

Source : Free On-Line Dictionary of Computing

Defense Information Systems Agency
     
        (DISA) Formerly called the Defense Communications Agency
        (DCA), this is the government agency responsible for managing
        the {Defense Data Network} (DDN) portion of the {Internet},
        including the {MILNET}.  Currently, DISA administers the
        {DDN}, and supports the user assistance services of the DDN
        {NIC}.
     
        {Home (http://www.disa.mil/)}.
     
        (1994-12-01)