Did you interview troops who's mission was not direct hand-to-hand combat, i.e., pilots, medical, clergy, etc.?

Gary Weimberg: Victoria,

We interviewed so so so many people, but we really focused on infantry, those who do killing a rifles distance away.

And yes, the distance to the act of killing is a big difference to soldiers, but it still is a huge impact on the individual.

There is much info on this in the literature, I recommend ON KILLING by David Grossman.