Six years after an invasion he opposed and six weeks in office, President Barack Obama on Friday drew a finish line for the Iraq War, promising to end the combat mission in 18 months and to follow by pulling all troops out by the end of 2011. Even with the end of the combat mission, a force numbering between 35,000 to 50,000 American forces will stay behind in non-combat roles, with the final troops not slated to leave until December 31^st in 2011. His decision to leave a sizable force was welcomed by some congressional republicans, including former presidential candidate Senator John McCain, while some democrats were concerned too many troops would remain in Iraq. McCain said he is cautiously optimistic that the plan as laid out by the president can lead to success.