* recommended reading
* WaPo, Military Envisions Longer Stay in Iraq: Officers Anticipate Small 'Post-Occupation' Force.
Such a long-term presence would have four major components. The centerpiece would be a reinforced mechanized infantry division of around 20,000 soldiers assigned to guarantee the security of the Iraqi government and to assist Iraqi forces or their U.S. advisers if they get into fights they can't handle.
Second, a training and advisory force of close to 10,000 troops would work with Iraqi military and police units. "I think it would be very helpful to have a force here for a period of time to continue to help the Iraqis train and continue to build their capabilities," Odierno said.
In addition, officials envision a small but significant Special Operations unit focused on fighting the Sunni insurgent group al-Qaeda in Iraq. "I think you'll retain a very robust counterterror capability in this country for a long, long time," a Pentagon official in Iraq said.
Finally, the headquarters and logistical elements to command and supply such a force would total more than 10,000 troops, plus some civilian contractors.