Choose propulsion for range, aviation, and politics

Propulsion choice reaches far beyond the engine room. Nuclear power supports global endurance and allows more fuel to be carried for aircraft or transferred to escorts because the carrier does not burn bunker fuel for its own movement. Gas turbines avoid the political concern of bringing a reactor into major ports and can generate power rapidly for electromagnetic launch systems. Oil-fired steam can support steam catapults, though it is an unattractive modern solution beside the alternatives. The correct choice depends on range, deck system, task-group support, budget, and domestic attitudes toward nuclear ships.