Recognizing that the government has been wary from the outset about the creation of armed, mainly Sunni groups under U.S. control, American military officials are taking several steps to prevent their sudden disintegration. American officials see the Sons of Iraq as a central factor in the reduction in violence, along with the temporary increase in U.S. forces, a year-long cease-fire imposed by a Shiite militia leader and the stepped-up assassinations of key insurgents.

John's unit -- 2nd Battalion of the 4th Infantry Regiment, attached to the 1st Brigade Combat Team, 4th Infantry Division -- has set aside funds to pay Sons of Iraq guards for 90 days in case the Iraqi government does not. U.S. soldiers say they will sit in as Iraqi officials hand out salary payments during the first few months. And the Americans have demanded that the Iraqi government refrain from arresting any of the Sunni fighters, many of whom are former insurgents, unless authorities have arrest warrants issued within the past six months. That will make it harder for the Shiite government to arrest Sons of Iraq leaders for acts committed before they joined forces with the Americans.