This is what happens when the military gets involved in nation building.

It is not their job to train Karzai's security forces.

I can't think of anything that will destroy the morale of our forces over there faster than this ongoing problem. It's hard enough being constantly vigilant against your enemies without worrying about your supposed friends shooting you in the back.

Those people aren't our friends.

It's time to get out of there.

http://abcnews.go.com/blogs/headlines/2012/08/afghan-policeman-kills-u-s-service-member-on-joint-patrol/