What is Reddit's opinion of From Just War to Modern Peace Ethics (Arbeiten Zur Kirchengeschichte)?

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Just picked this up the other day actually: https://www.amazon.com/dp/3110488485?psc=1&ref=ppx_yo2_dt_b_product_details. Just War theory is interesting but as others have pointed out below, actually applying it seems incredibly difficult and could be manipulated to the point that the individual soldier serving could be mislead. Overall, I would say the solider isn't culpable of serving in an unjust war unless it becomes abundantly clear to him that it is unjust. In that case, however, you can't just leave so idk how one would actually do that.