Telemetry is a bit of a non-issue for many national security applications-they run on special air-gapped networks with zero direct access to the public Internet, Windows can try to phone home to Microsoft all day long, it’ll never get through.

And disabling telemetry doesn’t require LTSC or Enterprise G. All Enterprise, Education and Server editions support “Diagnostic data off” telemetry level. Even if that’s not the default, most enterprises who want that will build their own install images with that setting configured.