DS is way into Plan B. Fwiw, honestly we expected better communication from a Service Academy...I suppose it's just the nature of these things. They're extremely busy this time of year I presume. Regardless, having spoken to previous cadets I've been told they send notifications to the waitlist that the time period is over. Not sure how true that is so take it with a grain of salt.
Best of luck to you and your DS in the next few days!