CAMP LEJEUNE, N.C. (AP) - Declaring "I have come to speak to you about how the war in Iraq will end," President Barack Obama on Friday moved to fulfill the defining promise of his campaign, announcing that all U.S. combat troops will be withdrawn by September 2010. But in the same speech to Marines at Camp Lejeune, N.C., he revealed that the vast majority of those involved in the pullout will not leave this year. He also said that tens of thousands of U.S. personnel will remain behind afterward.