Will Obama Actually End Combat Missions in Iraq?

Recently the Obama Administration has stated that it plans to effectively end combat missions by the end of August.  This would end Operation Iraqi Freedom, though if I remember correctly, we already declared "mission accomplished" there and began Operation New Dawn.

As American military history has shown, we will most likely never leave Iraq completely -- for though this new mission, according to the administration, will be the end of combat for Americans, our government will still maintain a large and expensive presence in Iraq, "supporting and training Iraqi forces, counter-terrorism missions and protecting US civilian and military initiatives."  How this is distinguishable from combat missions I'm not sure, but at least we can hope that about 10,000 of our boys might come home.

This brings one big question:  Can we actually trust this will happen?