The only reason military ballots shouldn’t be counted within four days is if the military member did not leave sufficient time for their ballot to arrive before election day, or if the military postal system deliberately delays the ballots. The extra four day leeway is built in incase the ballot you mailed to get there before the election is delayed. Six days less to cheat in the election will not affect many ballots.
Unless it has changed, you have to ASK for an absentee ballot. In theory, you ought to get one promptly. In practice? As noted in my above post, I asked for one while stationed in Korea more than 2 months out, and received it after the election.