agape

“The gospel is that everyone being loved by God must be my beloved too, even if they consider me their enemy, even if their interests clash with mine."

-John Howard Yoder, He Came Preaching Peace

Today at the church I attend, the pastor led us in prayer, and asked that U.S. soldiers are able to show and feel agape in what they are doing.

I'm not entirely sure how a soldier can show agape, short of laying down his/her arms. Can you love your enemy while killing him/her? Does taking up arms, in any cause, allow for a godly, selfless, forgiving love?