The not going to war excuse just feeds their pride. Ask your wife if she was being attacked if she would want you to fight the attacker. Then ask if she would want the same assistance given to her next door neighbor. What about the neighbor three doors down, the next street, the next city, country and so on. Where does one's responsibility stop in regard to their neighbor?
JW's rarely reason on this because they would have to forfeit a major source of pride and perceived moral superiority on this issue... not to mention actually believe the bible.
We must not forget that Cornelius was an active duty roman army officer when baptized.
Rom 13:1,3-4,6 (NIV) Everyone must submit himself to the governing authorities, for there is no authority except that which God has established... Do you want to be free from fear of the one in authority? Then do what is right and he will commend you. For he is God's servant to do you good. But if you do wrong, be afraid, for he does not bear the sword for nothing... This is why you pay taxes, for the authorities are God's servants, who give their full time to governing.
1 Pet 2:13-14 (NIV) Submit yourselves for the Lord's sake to every authority instituted among men: whether to the king, as the supreme authority, or to governors, who are sent by him to punish those who do wrong and to commend those who do right.
Temporary, Practical Submission To Worldly Authority Versus Eternal Submission To God
Luke 20:20-25 (NIV) Keeping a close watch on him, they sent spies, who pretended to be honest. They hoped to catch Jesus in something he said so that they might hand him over to the power and authority of the governor. So the spies questioned him: "Teacher... is it right for us to pay taxes to Caesar or not?" He saw through their duplicity and said to them, "Show me a denarius. Whose portrait and inscription are on it?" "Caesar's," they replied. He said to them, "Then give to Caesar what is Caesar's, and to God what is God's."
John 18:36 (GLT) Jesus answered, "My kingdom is not of this world. If My kingdom were of this world, My servants would have fought that I might not be delivered up to the Jews. But now My kingdom is not from here."
When (And Only When) Not To Obey The Authorities Of This World
Acts 4:19 (TEB) But Peter and John answered them, "You yourselves judge which is right in God's sight, to obey you or to obey God."
Acts 5:28 (NIV) "We gave you strict orders not to teach in this name..." Peter and the other apostles replied: "We must obey God rather than men!"