I remember a conversation with a PMS of the school, which turned out to be the school my son will be choosing to his 4 year scholarship at. That conversation was way before the board.
Anyway, I did ask him about 4 year vs. 3 year. His immediate reaction was, "Oh, from us, he will go in as a 4 year scholarship candidate" It was clear that the PMS does have an avenue of input (not a final say, but an input). I asked him why they would "recommend" a candidate for a 3 year, not 4 year. I asked him whether it is because he is not sure about the candidate's preparedness, readiness, or commitment to the Army as an ROTC candidate. The answer was NO. That's not the consideration. Most likely reason is whether that candidate is a strong candidate for the SCHOOL (from the school admission's points of view).
One caveat though: this is a highly competitive school with tough admissions scene, and one of the most expensive private schools (~$43k/year tuition). I don't know whether these factors are also part of the equation or not for other schools that don't fit this profile.
He did mention that sometimes, it's the decision by the Cadet Command, if the candidate is a borderline case for a particular school, etc.
Now, all this is just a sample of one data point. I don't know whether this can be generalized to your situation.
I heard from one of the posters here (whether it was a public post of a PM message, I don't recall) that her/his kid's 3 year was later converted to 4 year by the PMS of the school. Throughout all the time I read about other's experience, one thing becomes VERY clear: talk to the PMS. There is A LOT they can do for you, even though the final decision is made by the CC.
Good luck.