I figured if he was back home within a year, he had been wounded. And the army retiring him was another major clue. My brother was wounded while in the army and that's what they did for him.
However, Michael should have told them, he had been hurt and was in the hospital. If anything, they would have stopped worrying that he was still in combat and could get killed.
But it was a good and happy ending. I liked it.
Chris