You dont know about Jesus' teachings. Jesus is the Law for His followers. He makes the Law for His followers.
blessings.
I don't know about Jesus teachings really? Let's not make this personal otherwise I would say you sound like a Paul follower not a Jesus follower.
Jesus followed the old testament law to the letter. Paul is the one who said we are under a new covenant not Jesus. John and James took issue with Paul as well.
If you truly follow Jesus you would do what Jesus did right?
Now, if you want to stay on topic, how does this apply to Christians in the military?
Are you saying it is impossible to serve your country and God as well?
Even if you could condem someone for joining, what about the draft? You completely ignore this point.
What should a Christian who is drafted do?
If every Christian followed Jesus to the letter, why would we need to have grace?