Several thoughts on this based on my son's experience.
- the approach used by each MOC can vary widely. One extreme would be they have boards stacked for a particular academy, and you will be considered for your 1st choice only. Especially if you have an LOA. GA senators do this, and they really like the LOA aspect as it can count as a "free" nomination and they can still (in most cases) nominate another candidate which they are charged for.
- If you end up with a board which is specific to your first choice, then you may want to play differently. DS's senate boards were totally stacked to the branch he had listed first. With very high ranking officers (O4 to O8 2 star/rear admiral range)! To waiver on preference there might backfire!
- The "bird in hand" aspect of an LOA is something to consider. If you are in a highly competitive area it might be a risk to list another academy as 1st choice. You could get the nom, but not the appointment. Or vice-versa. Especially given the point above.
- House noms will pull from smaller areas, and in competitive states you will have a better chance with them then the senators. In DS's case, they did not stack the boards specific to certain academies as heavily.
In DS's case, they knew he already had a senate nom, and applauded him for going ahead with the interview. Toward the end of the interview the subject of academy preference came up in the context of "well, you'll likely have a sure thing with the LOA". Being truthful, he respectfully volunteered that in fact, he had just received notice of appointment to that school.
That's where the dialog became harder. He had to navigate the point that he would like to be considered for the other academies as well. Not bad, just not smooth. My son's perception was that they just did not know how to deal with it, and a couple of the interviewers looked at him with a "what are you trying to achieve" look. He explained that two of the schools were very close in preference. And that while he learned more about the second choice school he wanted to keep his options open.
Again, not a bad dialog, just hard. But he had to do it, otherwise they would have given him another nom to the LOA school and maybe not even considered him for the others.
- All that said, our view is it's still best to be up front. If you have not decided 100% you should be allowed that option. This may backfire a bit if the interviewers are hardcore for "their" school. But most DS saw were trying to be objective, especially if it's not a stacked board.
- The dynamics of LoA's really impact this process in highly competitive states. IE: It can really skew who get's noms for which schools. And given one tends to award them earlier, that impacts highly qualified candidates for chances to other schools in terms of noms. IE: if a candidate was considered highly & equally qualified across multiple schools, LoA's timing influence the outcome.
- The dynamics could be completely different in less competitive states. Many on the forum report getting multiple noms for multiple schools.
But that appears to be quite rare in GA, even just getting noms for two schools pretty much requires at least one to be from the house or other source. All indications are the senators coordinate to not duplicate noms, even to different schools.
So your question is fairly complex. It will depend on your state, and even MoC's approach.
There is a broader issue that we see as the big three each use LoA's differently, with different timing. Even with USMA significantly reducing the number of LoA's this year the timing aspect alone impacts things.
But one thing is clear- if you do not ask or indicate to be considered for more than one school, you may miss that opportunity! Even if that means having to refrain from gung ho "beat XYZ" type interactions that some board members are looking for.
In any case, congrats on the LoA, prepare the interviews like you are doing. And maybe think through how you will answer the preference question. Or how to raise it if it's not asked.
Good luck, and let us know how it turns out!