The current U.S. strategy in Iraq is called "The Surge", and the idea is to bring more forces into Baghdad to stop the violence that's threatening to destabilize the U.S. puppet government, and give that government breathing room within which to establish stability. The "Surge" has been going for several months and in the news are many articles glowingly claiming there is a decrease in violence and therefore that means The Surge is working.
The linked article offers a different view: "The Bush administration is turning Iraq into a test tube for modern techniques of repression, from sophisticated biometrics that track populations to devastating weapons systems that combine night-vision optics from drone aircraft, heat resonance imaging and deadly firepower from the sky to kill suspected insurgents."
They claim The Surge is "working" because U.S. forces are terrorizing the Iraqi's into submission. Or: "loose rules of engagement that allow U.S. troops to kill Iraqis at the slightest sign of hostility, have contributed to what U.S. generals and a growing number of American journalists are hailing as an improving security situation."
The pattern is similar to "operations used in El Salvador and Guatemala in the 1980s to eradicate leftist guerrillas and their political backers." In Iraq there are groups which are effectively death squads being led by Sunni Sheiks.