Steve and atsheeran,
Thank you for your responses. As I said in my post, just war theory tends to make my head hurt.
I agree with atsheeran that a just war does not necessarily validate or excuse all actions taken during that conflict. (CCC 2312 - 2314) But, barring participation in an intrinsically immoral act such as genocide, a soldier is expected to carry out his orders honorably and his participation in normal wartime activities do not carry the burden of mortal sin. That’s really what I meant to convey in my post.
When I was a teenager I used to go to a pacifist church with a girlfriend of mine. Their stance was clear – for the most part. Any killing was a sin. Period. Although at the time I was visiting the church (late 1950s), men in good standing in the congregation could serve in the Reserves since at the time, serving in the Reserves meant you were never going to see any action. Most of the young men served their military time as medics, however.
Being a Catholic is rather more complicated – always having to judge where our duty lies – duties toward peace, allegiance and duties to our government, duties for our family. We have the wisdom of hindsight and distance to know that Hitler’s actions in taking Europe to war were unjustified – but would the average German in the street have known that? He would want to protect his family and country. And he should expect to be able to rely on the prudential judgment of his leaders. (My in-laws were able to get out of Germany in 1939, so there was handwriting on the wall, but not everyone had the resources and capability of leaving.)
Of course when it came to the Holocaust and massive killing of Jews, gypsies, Ukrainians, and so on, then mortal sin was involved. There is historical evidence that men who could not bring themselves to participate in killing of Jews were actually excused that duty. (I can find that reference if you like.) So in a way the German command recognized that killing innocent, unarmed civilians is repugnant to people. It’s against the natural law – although I doubt they saw it that way.
Basically I’m agreeing with both your posts and I appreciate your thoughtful responses. Thanks.