Pullout defined
Ordering all of our forces to drive north into Kurdistan. Setting up an independent Kurdish nation. Flying most of our forces home from there, and leaving enough to ensure the integrity of Kurdistan.
This could also be used as a threat to Malaki and his intransigent shiite buddies to compromise politically with the sunnis or lose all US military support.
If the Iranians go in to fill the void, great! We support sunni roadside bombs against the Iranians!