Comments by "Gregory Wright" (@gregorywright4918) on "Naval Engines - Rotate that shaft!" video.

And don't have to worry about stack gases...
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@Drachinifel Radar is an excellent example of the latter case...
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@BeefSupreme115 Drach says he cuts his coverage off from dealing with post-1940s naval issues. The quick answer to your question is "all of them", with the exception of the "big" naval gun, which would be more than 6" (155mm) these days. Guns from .30cal to about 5" are used, the smaller ones for anti-speedboat to anti-missile defense (with appropriate automatic radar/FLIDar control) and the bigger ones (2" to 5") for anti-ship and shore bombardment. Missiles could be considered "projectile weapon systems", and there are ASW, ASUW, and AAW and AMW versions. Plus there are still ASW mortars and rocket launchers, as well as full-size torpedo launchers.
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@petersouthernboy6327 Drach cuts his coverage off in the late 1940s, and nuclear power was a 1950s+ thing, so I doubt he will cover that. A nuke plant is just a big, heavy black box that generates steam, in one sense.
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@kakwa The Mogamis were supposed to be "light cruisers" with 6" guns, but they conspired to up-gun them once they left the treaty system so they shifted from "light" to "heavy". The IJN valued 8" cruisers more, and looked at the lighter cruisers as destroyer division leaders rather than full cruisers like the Brooklyns.
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@Thirdbase9 Using the steam to directly push the ship would be much less efficient, plus you would have to de-salinize a lot of seawater to replace the steam in the boilers, or risk quickly corroding your boiler's tubes with salt.
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