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In computer networking, MILNET (fully Military Network) was the name given to the part of the ARPANET internetwork designated for unclassified United States Department of Defense traffic.<ref name=":0">DEFENSE DATA NETWORK NEWSLETTER DDN-NEWS 26, 6 May 1983</ref><ref>Harris, Dr. Thomas G., et al., "Development of the MILNET," 15th Annual Electronics and Aerospace Systems Conference, Eascon 82, IEEE CH1828 Conference Record, 1982, pp. 77-80. </ref>
MILNET was physically separated from the ARPANET in 1983.<ref>ARPANET INFORMATION BROCHURE (NIC 50003) Defense Communications Agency, December 1985.</ref> The ARPANET remained in service for the academic research community, but direct connectivity between the networks was severed for security reasons. Gateways relayed electronic mail between the two networks. BBN Technologies built and managed both the MILNET and the ARPANET and the two networks used very similar technology. It is also known as "Military Net."<ref name=":0" />
During the 1980s the MILNET expanded as part of the Defense Data Network,<ref>Template:Cite book</ref> a worldwide set of military networks running at different security levels. In the 1990s, MILNET became the NIPRNET.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>