For we know him who said, “Vengeance is mine; I will repay.” And again, “The Lord will judge his people.” (Hebrews 10:30, ESV)
The other side of dealing with an enemy is wanting to pay them back when they do something to hurt you. It is easy to get the attitude of trying to get even with the people who hurt American Soldiers. Fight the urge. Remember that the punishment God deals out for wickedness is far more severe than whatever we could come up with. Let Him be the judge and executioner.
Prayer: Lord, give me the faith to trust in Your justice.