The Troops in Iraq

So, in leadership class today, we were doing current events. Some students chose some random stuff about Japan, something about Cuba, and something about Mexicans killing off us Americans. But one thing seemed to be so important that everyone was doing an article about. Obama is taking the troops out of Iraq. There are currently 142,000 troops there right now, and Obama wants to take all of the combat troops out. I don't know what this means exactly, but doing so causes the government to leave 35,000-50,000 troops in Iraq. Way to keep his promise. He said that within 16 months of being in office, all of the troops will be out of Iraq. Now this has been changed to 19 months. I don't know how they are going to be able to do it, but by Christmas of 2011, ALL of the troops are supposed to be back home.

Do you think this is going to work? Because I honestly think that something will happen to stall the troops, and they are going to be stuck there for another three years.