Does McChrystal not know his own Army doctrine?

In light of reports that US President Barack Obama wants to send 34,000 more troops, reportedly; that’s four-fifths of a loaf for Lt. Gen. Stanley McChrystal, but far less than Army doctrine says will do:

The Army's counterinsurgency manual estimates that an all-out counterinsurgency campaign in a country with Afghanistan's population would require about 600,000 troops.

So, why is McChrystal asking for 40,000 when it’s nowhere near what’s needed?

Another Vietnam? Should we just call him “Westmoreland” now and beat the rush?