Enlisting in the CGR, ANG, NG, USNR,(what ever) has little or no bearing on becoming an “O”.
Enlist only if it will help your current situation, i.e.; helps pay for college and/ or possibly turn into a full time Federal job later.
I’ve known a pilot with Bachelors’ of History. I think there are some Art Major pilots out there too. That might not be the best route, but possible.
That’s my limited experience. But if your 21years old with no college, you are already up against the age clock. Need to get busy