None of the historical ensigns are correct for the early German and US ships. For example, every German ship has the war ensign from 1935-1945, earlier ships should have the Imperial war flag or the various interwar flags. US ships shouldn't all have 48 star flags either, anything that was built before 1912 should have 45 or 46 star flags. Any chance of adding a mod in your great modpack that has these?