Defense Data Network

(DDN) A global communications network serving the US Department of Defense.

Composed of MILNET, other portions of the Internet, and classified networks which are not part of the Internet.

The DDN is used to connect military installations and is managed by the Defense Information Systems Agency.

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defect analysis defect density Defense Advanced Research Project Agency Defense Advanced Research Projects Agency Defense Communications Agency	DDN Defense Information Systems Agency Internet Registry MILNET NIC.DDN.MIL	Defense Data Network Network Information Center Defense Information Systems Agency Defense Trade Regulations deferral definite clause