The United States is aiming to send 20,000 to 30,000 extra troops to Afghanistan by the beginning of next summer, according to the chairman of the U.S. Joint Chiefs of Staff.  The plan is not unexpected, and from a military point of view is meant to allow U.S. and NATO troops not just to clear out Taliban insurgents but also to bring enough stability to allow economic development, as highlighted in this analysis by Reuters Kabul correspondent Jon Hemming.