I see themes in the great posts above:
1. Confirm details in writing with an authoritative source from the school. Be aware that unless in writing, things can change.
2. Confirm WHAT is covered and for how many years. Ex. Double occupancy and 14 meals/week plan, for all four years? freshman year only? Only to 8 scholarship recipients per year? Do you still get money if you move off campus (*which happens at SOME colleges but not others), etc.
3. check all colleges you are considering as these benefits vary greatly.
I'd get it in writing which merit/ financial aid, and external scholarships you may be able to use vs lose too from each college for room/ board or to keep. Not uncommon for schools to take back scholarships for full ROTC scholarship winners vs sending them a check for the overage. But, some schools actually send them a check for the overage, which is nice.
In the end, excluding flight costs which are not covered by ROTC for his major, my DS MADE MONEY going to college on an ROTC scholarship. His second choice would have been 64k in room and board, other choices were even higher. The details matter - good on you all for completing your due diligence in planning - good luck.