Sometimes war is necessary and is right for Christians to participate in.
There hasn't been a war remotely like that in half a century, and given the current geo-political state, there isn't likely to be a war like that for the rest of our lifetimes.
A war is not "right" when Nation A goads Nation B into attacking and then claims it's only defending itself.
The Bible says “do not kill” as the general principle that killing is wrong. Then, like most legislation, it sets out the specific circumstances in which this general principle may be disobeyed. From the OT, in some cases, war appears to be one of those specific circumstances. Note how David in the Psalms says how God trains his hands for war. Note how in the Gospels John the Baptist’s doesn’t tell soldiers to leave the Roman army, but to be satisfied with their pay. Pacifism is not a Christian fundamental.
John the Baptist was probably talking to Jewish temple guards rather than Roman legionaries.
The normal pay of Roman legionaries in occupied territories was what they extorted from the oppressed locals. The only way a Roman legionary could follow John's advice was to desert the military.
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