Pat Tillman Killed by Friendly Fire?

Those are the various reports I've seen today of the football player who gave up a lucrative contract to go fight in President Bush's War on Terror.

Unfortunately, "friendly fire" is almost a natural consequence of combat. When you shoot, you're not always sure who is on the receiving end. Sometimes it's the identified enemy, sometimes it's a colleague, and sometimes, it's a pregnant woman or a child.