I would add that some schools may have unused scholarships left! My DD was contacted by a ROO earlier this month asking if she was still interested in ROTC because she never completed her application. Long story, she's hoping to secure a scholarship. I would recommend you contact the ROO for any school you're interested in and ask if they have any scholarship opportunities available.Most here would have to research deadlines. Which you can also do.
As far as the rest? No idea. Or any idea how to know that info, factually.
I always recommend visiting ROTC programs at your nearest school, or interested colleges during summer admissions visits. Most provide sessions as part of visits. You can ask questions. A good source of info!
Good luck to you on your endeavors!
What are each service's applicaiton and deadline dates? Are there any changes to the application process? Any reductions or additions in the numbers of scholarships?