Actually, one of the big inefficiencies that is sort of the AROTC joke is that the candidates selected at the first board are likely to get and accept appointments to USMA anyway. Completely independent. However, if you are offered a scholarship and an appointment and accept your appointment, you must turn down your scholarship offer. You cannot accept both with the idea that you can give Beast a try and then use your AROTC scholarship as a back up if West Point turns out not to be for you. So, in summary, they do not coordinate on acceptances but the Army tracks these things in such a way that an individual can only contract with a single commissioning source.