Fission and fusion reactors are really more like in-between renewable and non-renewable. Sure, it relies on materials that are finite, but there is way, way more of that material available in comparison to how much we need.
Making this distinction is necessary to un-spook people who have gone along with the panic induced by bad media and lazy engineering of the past.
The DoD? No.
But I think you’re right that all energy forms should be nationalized. The only way humanity can continue to be the dominant species on earth is if we can declare a “war on pollution” and commit to it in the same way we could commit to actual war.