If "Mission Accomplished", then WHY are we putting MORE troops into Iraq?

Remember that?
With the US death toll in Iraq passing 100 this month and mid-term elections just days away, the Pentagon said the US force in Iraq has grown to 150,000 troops, the biggest it has been since January.Link
A Pentagon spokesman attributed the growth to overlapping unit rotations, but it came amid surging violence that so far this month has claimed the lives of 101 US troops and many more Iraqis.
"Several units are transitioning out as several are transitioning in," said Lieutenant Colonel Mark Ballesteros, who said that as of Monday the number of US troops in Iraq was 150,000.
A Pentagon official, who asked not to be named, said the US Army's 4th Infantry Division was near the end of its year-long rotation.
US commanders in the past have timed the overlap of troop rotations to increase the US military presence during Iraqi elections and other critical milestones in the political process.
The increase this time follows the Muslim holy month of Ramadan, which US military officials anticipated would bring higher levels of violence, and comes just ahead of the November 7 congressional elections in the United States.
Pentagon officials, echoing Vice President Dick Cheney, have expressed concern in recent days that Al-Qaeda is trying to step up the violence in Iraq to influence the outcome of the US vote.
Eric Ruff, the Pentagon press secretary, said he did not know why US troops levels were climbing.
"This is news to me," Ruff told reporters. "Talk to MNF-I (Multi-National Forces-Iraq). That's General Casey's decision."
The increase is noteworthy because US troop strength in Iraq is only 10,000 under the all-time high of about 160,000 reported in January after the Iraqi elections.
It had fallen to as low as 127,000 in June when US commanders still believed they could make troop cuts this year.


