Like said above, you approach it as choice A, B, C, etc. Meaning A, would be dream school (get into it) plus a Type 1 AFROTC scholarship which pays full tuition, then define each beyond that. For my DD, she was going for a nursing scholarship, so she picked schools with nursing, AROTC, and prioritized those with direct nursing placement, or ROTC nursing slots allocated for nursing school. We gave her a budget we could afford. It could get her four years at the most affordable choice with anticipated merit scholarships, which she choose on that she easily got into, and the other side of the spectrum is we could afford 1 year at the most expensive school without much merit aid, which her school was the hardest to get into, and had direct nursing placement as a freshman. She doubted herself so she made it her last choice. She did earn a 3 year AD for Army and given her 1st (safety school), 3rd and 4th (stretch school) choices and chose that stretch, most expensive school (Army pays for tuition, fees, books, and a stipend for 3 years starting sophomore year, and the school covered room and board on campus for all four years for national scholarship recipients, even 3 year scholarships). If she had not won a national scholarship, she would have gone to one of the other 3 schools on her list, and competed for a campus based. She also understood that if for some reason her ROTC scholarship went away, like she decided against ROTC after her freshman year, then she would be transferring to a more affordable school. Everything worked out and she graduated Spring of 2020. The point of my long wordy post is, organize what you can afford, communicate that clearly with your son, and then come up with different paths based on all the various outcomes, Type 1, 2, 7, or no scholarship, school acceptances, merit awards awarded (and school's policy on whether he can use them with a type 2 or not), etc. Until he knows which schools he gets into, and what merit aid, and if he has a scholarship or not and which type, he won't be able to make a definitive choice, but he will be prepared with all the pertinent info when the time comes. This is why don't let him apply early to schools that are binding if accepted, beyond that, if you can afford the application fee, there is no limit on where to apply to so he can keep his options open.
Final point to this, my DD did not want to apply to her stretch school because she thought she wouldn't get into the direct nursing even if she got in, and we couldn't afford it without a scholarship, however, it was the only in state (private school) nursing program for Army so she was required to list it on her scholarship application. On the very last day, I think it was February 1st, we "strongly encouraged" her to finish her application since she had already sent them her test scores, and she did right on the deadline. Had she not applied, when she received the scholarship with the option to that school, she would have regretted not applying.