from my Marine Corps days, I recall that "casualty" implies the basic idea of removing a Marine from being an active combatant. This can occur through severe injuries, death, capture, going UA, etc.
The term casualty, then, can apply to deaths and all those other things, lumped into the phrase "non-fatal casualty." Is there a single word that captures that same meaning? I feel that there is, but can't remember! Or, I could simply be wrongly remembering that there was a single word... in which case, curses on getting old.