My friend wanted to join the military but he later changed his mind because he thought joining the military isn't right for a Christian. When I asked him why, he said killing in any form is a sin and that he doesn't want to kill so he withdrew his application. My question therefore is, is it right for a Christian to join the military? Take for example the war against Iraq. Most people are against this war but if you are a Christian in the military, you have no other choice than to fight and kill people.

What do you think? Is it bad for a Christian to serve in the military? What does the Bible say?