Country that put backdoors into Cisco routers to spy on world bans foreign routers
(www.theregister.com)
I mean... supply chain hardening has been a concern for most of the three letter agencies (and governments around the world) for years. There are very serious concerns over how basically every NIC comes out of a factory in China and what the implications of that are.
If DoD actually do have a list of vetted and hardened products, that WOULD be a very good baseline for if you care about security at all. Less so from the US government, but that can then be compared against similar lists from other countries.
And considering that basically every TLA has the same concerns, if those orgs are willing to spend their budget? DoE and the like ain't gonna complain.