Why warship combat systems should be air-gapped

How can warships and other military systems reduce their exposure to hacking?

Keep combat networks physically and logically separate from civilian internet access so a remote attacker has no direct route into critical systems.

Cyber defence begins with a basic architectural question: why should an aircraft carrier's critical computers be connected to the public internet at all? Combat systems can operate on a military intranet separated from the civilian connection used for ordinary crew access. That air gap removes the easiest route for a remote attacker and makes intrusion materially harder. Isolation should be designed into the system before software defences are asked to protect an unnecessary connection.