From what I know from helping underclassmen apply for scholarships.
- You can only apply for national scholarships (3-4 years to top five schools of choice) during high school.
- Once in college, the equivalent scholarship option is to apply for a campus-based scholarship (2-3 years), which means you have to apply through the cadre at the school.
Other scholarship options:
- SMP: attend basic training (and Advanced Individual Training), then join a reserve unit for drills as a officer-in-training, receive the same benefits as a national/campus based scholarship, but cannot compete for active duty. You have to commission into Army Reserves (which is a great option for attending grad school/med school/or any other professional school right after undergrad).
- National Guard: just the same as SMP, but with a National Guard unit in whatever location desired as long as they can support the scholarship.
I am not an expert on this, but hopefully this gives enough information to spark some questions for a recruiter. If there is a recruiter for that specific ROTC program, they will be able to give the best information about all of these scholarships. Otherwise, you may need to speak with recruiters from active duty, Reserves, and National Guard to learn about these options.