Decision making behind Obama's surge in Afghanistan

A lengthy article in the NYT details how Obama came to make his decision on escalation in Afghanistan. It says:

-Mr. Obama also firmly closed the door on any withdrawal. “I just want to say right now, I want to take off the table that we’re leaving Afghanistan,” he told his advisers.

- Mr. Obama was leery. He had received a memo the day before from the Office of Management and Budget projecting that General McChrystal’s full 40,000-troop request on top of the existing deployment and reconstruction efforts would cost $1 trillion from 2010 to 2020