If they mailed the ballots late,,the ballots should be accepted late by an equal number of days. No election should be validated without counting the military ballots. There were lots of elections decided by a number of votes far less than the missing military vote.
Such as Minnesota, in which military ballots were expunged, while 490 (+/-) ballots from convicted felons were accepted.
Your common sense remedy only makes since if the people responsible for making sure our soldiers are availed of their Constitutional right to vote are pure in heart—regardles of their political affiliation. Sadly, it appears too many of the politicl class are devoid of ethic, morality and conscience.