Only a two-page 'note' governs U.S. military in Afghanistan

Although President Bush pledged in a 2005 declaration signed with Afghan President Hamid Karzai to "develop appropriate arrangements and agreements" formally spelling out the terms of the U.S. troop presence and other bilateral ties, no such agreements were drawn up.

But after a U.S.-led airstrike last week that United Nations and Afghan officials have said killed up to 90 civilians — most of them children — Karzai has publicly called for a review of all foreign forces in Afghanistan and a formal "status of forces agreement," along the lines of an accord being negotiated between the United States and Iraq.

The prospect of codifying the ad hoc rules under which U.S. forces have operated in Afghanistan since late 2001 sends shudders through the Bush administration,