BAGHDAD – As Iraqi security services prepare to take back their towns from the Americans on Tuesday, the sharpest arrow in their quiver is an elite, American-trained force with a reputation that leads many Iraqis to call it "the dirty brigade."

Its real name is the Counter Terrorism Bureau, and its commander insists it's professional, nonsectarian and not dirty at all.

Violence is already rising and will likely continue after the handover as different factions test the government's ability to manage without American backup. But Kalib Shegati al-Kenani, the Iraqi Army general who heads the bureau, is confident his force can cope and that his country will not slide into renewed sectarian warfare.

Its ranks are made up of Shiites, Sunnis and Kurds, al-Saedi said, but it does not publish breakdowns.