Zalmay Khalilzad, the U.S. ambassador to Iraq, calls on the new Iraqi unity government to take decisive action against local militias and outlines the U.S. role in security and reconstruction.

Iraq's new prime minister, Nouri al-Maliki, who was sworn in with 36 of his ministry appointments Saturday, said Iraqi forces could assume control of much of the country by year's end. Three Iraq analysts access the new government and the…