kabul  - Top US military officer General Martin Dempsey arrived in Afghanistan on an unannounced visit Saturday to assess the level of training the US will need to provide Afghan forces after Nato withdraws in 2014, an official said. An estimated 100,000 foreign troops have been fighting the Taliban for the past 11 years and are due to leave Afghanistan by December 31, 2014.
 to be replaced by a smaller contingent to train and advise their local counterparts.