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Defense Data Network
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<p>The Defense Data Network (DDN) was a <a href="/facts/Computer_network/3w5RM99p">computer networking</a> effort of the <a href="/facts/United_States_Department_of_Defense/dWAvf7e3">United States Department of Defense</a> from 1983 through 1995. It was based on <a href="/facts/ARPANET/LyMGWurJ">ARPANET</a> technology. </p>