Comment Re:How about some basic guidelines? (Score 1) 94
Alternatively, [National] Rule 1: put it on the internet, with suitable security, if doing so will save money
This.
In many ways the air gap is antithetical to the interests of both the government and any related organizations responsible for said infrastructure. The air gap is nearly impossible to manage in a sane and worthwhile fashion. You can read about the myth of the air gap here.