 JWICS superseded the earlier DSNET2 and DSNET3, the Top Secret and SCI levels of the Defense Data Network based on ARPANET technology.In day-to-day usage, the JWICS is used primarily by members of the Intelligence Community, such as the DIA within the DoD, and the Federal Bureau of Investigation under the Justice Department.Conversely, SIPRNet and NIPRNet comprise the overwhelming bulk of usage within DoD and non-intelligence government agencies and departments.