Three brigades add up to as many as 12,000 troops . More foreign fighters entering Afghanistan from Pakistan , general says . `` We 're facing a tougher threat , '' so more troops needed `` as quickly as possible '' Pakistan Gen. McKiernan commands Taliban forces in Afghanistan . David McKiernan has sought one more brigades of U.S. troops than one promised .
More foreign fighters entering Afghanistan from Pakistan , general says . `` We 're facing a tougher threat , '' so more troops needed `` as quickly as possible '' Pakistan Gen. McKiernan commands Taliban forces in Afghanistan . David McKiernan has sought one more brigades of U.S. troops than one promised .