Seriously, I sure remember a lot of my fellow midshipmen becoming Marines.
I will take your comment as a hint to revise mine though. The USN and Marine Corps are parts of the same naval service.
Incorrect. Something you failed to learn at Canoe U., obviously. Marines and squids both serve in the sea service. Although I had the misfortune of having to serve with a number of mediocre and lackluster squids, along with a few excellent ones, I didn't serve in the same naval service that they did. You can flap your gums as long as you like and it won't change that fact. The Marine Corps and the navy are two separate and distinct branches of the military which happen to report directly to the same appointed civilian leader.