So, if this followed even a base level of scripture or theology, no, military members would not go to hell for the killing of enemy combatants as the natural assumption is that they would kill you and as such you are right in defending your life and the lives of others. However, I don’t assume that Viv is that meticulous or nuanced when it comes to that, so I suspect that she’d default to ‘Military Bad’ and send everyone to hell if they weren’t a hippy that wanted to make love and not war. Side note: considering their hatred for Natzis, I honestly ponder their reasoning for why WW2 was a good war, but every other war is wrong and bad.