<p>@aglages
I will have to research it again. But it was a very reliable source, as I recall (might even have been on the USNA website). Actually, it is not really horse trading. Bad analogy there. Still, my understanding is that excess vacancies happen when an MOC does not have any qualified applicants. Such vacancies are used in whatever way USNA sees fit, including candidates with an LOA.</p>
<p>Again, I will try to track down my source. It was a year or so back.</p>