Are there just regular cruisers? So I keep finding conflicting information whether there are 4 or 3 'classifications' for cruisers. Battlecruiser, Heavy Cruiser, Light Cruiser are known but is there just a 'Cruiser Cruiser' that is like a 'Medium Cruiser' or is it usually just Light/Heavy Cruiser if those designations are used. Does any country use all three simultaneously?