Who is who?

"Lynch insisted that every volunteer is nominated by tribal leaders and vetted by Americans with retina scans and fingerprinting. The serial numbers of their AK-47s also are logged."

http://news.yahoo.com/s/ap/20071007/ap_on_re_mi_ea/iraq_knowing_the_enemy

This is the way to go. Nominated by the traditional local authority who knows everyone and their parents, then vetted by the Americans.

This is getting close to the heart of the problem, which is policing, controlling (in the European sense of the word), knowing who is who. Ultimately this is a social problem requiring a social solution. And that's what finally seems to be happening in Iraq.