The BBC has learnt that a new-look command structure will drive the continuing fight against the Taleban in Afghanistan. will now be led by a change in the existing command structure.
US General David McKiernan will now command both the US and Nato forces who are currently based in Afghanistan.
General McKiernan told the BBC's John Simpson that the move would create "a greater unity" among the forces. But the British Army has criticised the move, arguing that any big decisions will now be taken primarily by the US.
John Simpson reports from the Khyber Pass, on Afghanistan's border with Pakistan.