If someone in HS wants to fly grey airplanes for Uncle Sam THE BEST way to do this is to go to a service academy or ROTC. If you get picked up for a college based officer program your chances of going to flight school just improved dramatically. I don't want to say it's guaranteed but if you have good grades, don't get fat, and don't get in any real trouble you're about as close to a guaranteed ticket to flight school as you can get (for USN anyways). Yes, there's OCS but IMO if you know in HS that you want to be an officer why wouldn't you let Uncle Sam pick up the tab for college? Plus, based on what I've seen on this site, it's far easier to get into USNA/NROTC then it is to get an OCS pilot slot.Definitely some great advice here to strongly consider. My selected path I chose was enlisting in the reserves as an aircrewman to better my chances of becoming a pilot but still finishing school in a decent amount of time. In my opinion, after finally submitting my OCS packet for board next month, i'd recommend not going this route. It is a pain to try and go from enlisted to officer and honestly doesn't seem to carry that much weight. My recruiter said it best "The Navy already has and owns you, they want to get people they don't already have". Going to school and finishing with a solid GPA and great ASTB scores as a civilian is probably a best bet. You also get to apply early while still in school as a civilian, if you're already enlisted you have to completely finish school first and have degree in hand before you can apply. There are many hoops to jump through, but if you're set on joining, definitely aircrew as it is in the same field and community and you will learn a hell of a lot more about the different aircraft the Navy has as well as the different jobs pertaining to each aircraft.
Just my 2 cents based off my experiences.
There is no need to know a damned thing about Navy airplanes prior to becoming a Naval Aviator nor is there a need to know how a Squadron works. The program isn't set up to require those sort of prerequisites.