"If President Obama signs off on the military’s plan for more troops, the number would rise above 5,000. There are other U.S. troops inside Iraq that the Pentagon claims are on “temporary” assignments, though some of these deployments last up to one year in country. Counting these troops, the new forces going to Iraq will push the unofficial number of American forces on the ground in Iraq to over 6,000 troops." (thanks Amir)