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Leaked Windows 11 "Government Edition” that has no telemetry tracking or bloatware is actually FAKE
(www.windowscentral.com)
For all things Windows.
Not for military or nuclear deterrents they don't, and it's not "just" setting group policies, but actually hardening and packaging software using government standards.
But they also use Enterprise edition, which I aluded to in the comment you're replying to... geez.
Depending on products yea, but if they are using windows it's windows enterprise. I agree saying just gpo is an understatement, you can get the automated stigs from the public disa site for all the things they harden. https://public.cyber.mil/stigs/supplemental-automation-content/