The marines may have has their origin in fighting from ships but that has very little to do what the usmc does today. Today the marines still have some naval roles but today they’re primarily the us expeditionary force. They are designed to be almost anywhere in the world in a short time, and at least establish a zone for additional forces to land.
Plus the modern military is highly integrated and one branch alone can’t really do much. And of course politics and money, the more things a particular branch does the more political clout they have to get more funding
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