The New York Times's Michael Gordon reports that even the ISG's own military advisers are dubious about its military recommendations, not to mention its goal of a large troop withdrawal by 2008:
Jack Keane, the retired Army chief of staff who served on the group's panel of military advisers, described that goal as entirely impractical. "Based on where we are now we can't get there," General Keane said in an interview, adding that the report's conclusions say more about "the absence of political will in Washington than the harsh realities in Iraq."
Further down in the piece, Gordon writes:
The group's final military recommendations were not discussed with the retired officers who serve on the group's Military Senior Adviser Panel before publication, several of those officers said.
It seems like the ISG isn't all that different from the Bush administration.