Fusion cell teams have helped collect and analyze intelligence not only against AQI and Sunni insurgents but also against Shiite militias and foreign fighters, say U.S. military officials.

Headquartered in an old concrete hangar on the Balad Air Base, which once housed Saddam Hussein's fighter aircraft, about 45 miles north of Baghdad, the Joint Task Force in Iraq runs fusion cells in the north, west and south and in Baghdad, U.S. officials said.

The headquarters bustles like the New York Stock Exchange, with long-haired computer experts working alongside wizened intelligence agents and crisply clad military officers, say officials who have worked there or visited.

"The capabilities for high-end special joint operations that exist now only existed in Hollywood in 2001," said David Kilcullen, a terrorism expert and adviser to Secretary of State Condoleezza Rice.

Data gathered in a raid at midnight -- collected by helmet-mounted cameras that can scan rooms, people, documents and cellphone entries and relay the pictures back to headquarters -- often lead to a second or third raid before dawn, according to U.S. officials.

"To me, it's not just war-fighting now but in the future," Mullen said. "It's been the synergy, it's been the integration that has had such an impact."