<p>Here’s my understanding.</p>
<p>Yes, more than one candidate from a congressional district can get an appointment. This could happend in a couple of ways.</p>
<p>First, the other candidates could receive an appointment based on a nomination from a different souce(senatorial, presidential, vice-presidential). Also, unless the candidate gets a principal nomination from a MOC, candidates with letters of assurance are not counted against a MOC’s allotted slots at USAFA. In theory, all ten of a MOC’s nominated candidates could get appointments if they had strong credentials.</p>
<p>Yes, assuming there are other qualified candidates, if you son declines his offer of appointment, the offer will pass to the next highest ranked candidate in that district.</p>