Britain and U.S.A collaboration in Afghanistan after 9/11 and its failure causes

It is more than a decade that NATO forces are in Afghanistan and during this time every members of NATO has a role in Afghanistan. Britain and U. S. A. again were cooperating in Afghanistan war. Participation of U. K. with U. S. A. in security – defense affairs as a special relationship، can be analyzed in different aspects of Afghanistan war. This article by reviewing cooperation of U. K and U. S. in military- security operations in Afghanistan describes the situation of U. K. relation with U. S. after 9/11 and explains their failure in promoting war goals and defeating the Taliban.