Windows 10 Enterprise LTSC 2019 has a 10 year support window, and subsequent LTSC versions, 5 years. If you can get your hands on one of these licences you would presumably continue to receive security patches. If the US government is somehow not running on this kind of licence, it would be pretty funny, but I’m sure Microsoft would be lenient and let them jump onto whatever compatible LTSC version given its an American company.
Windows 10 Enterprise LTSC 2019 has a 10 year support window, and subsequent LTSC versions, 5 years. If you can get your hands on one of these licences you would presumably continue to receive security patches. If the US government is somehow not running on this kind of licence, it would be pretty funny, but I’m sure Microsoft would be lenient and let them jump onto whatever compatible LTSC version given its an American company.