Very different concept from Tor -- this is about passing sensitive information between dedicated government facilities, not about hiding some of the details of your activity on the public Internet.
The argument for Tor's benefit for military personnel (which may or may not have panned out in practice) was all about protecting some of their activity on networks controlled or at least monitored by their adversaries. That's almost the opposite of SIPRNet.
The argument for Tor's benefit for military personnel (which may or may not have panned out in practice) was all about protecting some of their activity on networks controlled or at least monitored by their adversaries. That's almost the opposite of SIPRNet.