ROTC is kind of a 4 year interview process. There are standard transcript reviews and conversational "interviews" to get accepted into program. You take classes through college. You have to pass a test (AFOQT) to continue in the program after your first year. You go to "Field Training" after your second year in the program. You take leadership roles in your third and fourth years in the program. You get assigned a post-graduation job based on your ROTC performance and your preferences at some point during fourth year.