Depends. The Russians went in hard and heavy with hundreds of thousands and you see what happened to them. Yet 700 of our Special Operations troops would be considered a HUGE force for that group. Afghanistan has to be considered a SOF war, rather than conventional. Iraq is OTOH, more "conventional" since it has the terrain that lends itself to tanks and mounted infantry forces. Apples and oranges.
This war can be WON but it has to be fought smart and not conventionally. So I guess that rules out the current administration. McChrystal was a special forces guy and Petraeus is a conventional guy, so there you go. We lose unless he admits to himself and the POTUS that we have to commit overwhelming special operators to go in and do the job right.
Until we recognize that the war extends into Pakistan, we have no chance of winning.
AMEN, Brother!