Every once in a while, I see a bumper sticker that quotes John 15:13 - "Greater love has no man than this, that a man lay down his life for his friends." The funny thing about seeing this quote on a bumper sticker is that it is often in the company of military-oriented stickers. In that context, the obvious implication is that being a soldier and risking your life for others is the greatest expression of love.
While I can appreciate the spirit of self-sacrifice behind that thought, I can't imagine that Jesus was trying to say "Greater love has no man than this, that a man go and kill other people for his friends." I wonder what the reaction would be if the verse ended with "lay down his life for his enemies." That seems more in line with Jesus teaching about loving our enemies. And in the end, that's what Jesus did.
Update: My friend Shane pointed me to this article entitled Thank God for Enemies.