\It might be interesting to compare and contrast how soldiers deal with the job of killing with how medics deal with the job of preventing death.* For example, a reverse triage situation presents a particularly difficult combination of acts of omission and commission.

*As an aside, many career park rangers have come upon multiple mangled corpses and have unsuccessfully administered CPR multiple times over the courses of their careers. Killologists should really talk to them at length about these sorts of things.
That is a very interesting question. I wonder if anyone has ever done any good studies on this among, say, EMTs?