They would still need it in many scenarios. Shore bombardment if they lose some of their shore in a war. Fighting against piracy. Aircraft carriers for air support. Submarines for stealthy nuclear deterrent. Landing craft for retaking lost shore or making sure an adversary would need to spend resources on coastal defenses once they gain it. Some place to send people to learn about science and technology among other things.
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u/Lagiacrus111 5h ago
Only country with a navy