To the OP: You’ve asked a question that is difficult to answer. You received an LOA, congrats on this! However, you are on step three of, what will become, a one thousand-step process by the time you get to an SOG. Concentrate on getting accepted into an academy and then concentrate on excelling as a leader and academically.
While the academies place you based ”on the needs”, your class standing and performance during your years has a LOT to say about where you’ll end up.
If, by some chance, you don’t get what you want, be the best Soldier, Marine, Sailor, Airman, OFFICER you can be. Your leadership will take note and will help you get where you want to be. Service to your Country where needed should prevail.
IMHO……..