The top US military officer AdmMikeMullen also suggested last week that the Pakistani government had "sanctioned" the killing in May of journalist Saleem Shahzad.
Chairman of the Joint Chiefs of Staff AdmMikeMullen said the US had soon to begin planning to withdraw the 47, 000 troops and military kit still there.
But last September outgoing Joint Chiefs of Staff Chairman AdmMikeMullen said that the Haqqani network "acts as a veritable arm of Pakistan's Inter-Services Intelligence (ISI) agency".