U.S. Captain Jesus Salas of the 1st Cavalry Division carries a roll of barbed wire in Baghdad’s Shi’ite suburb al-Sadr City August 18, 2004. (REUTERS/Pool/David P. Gilkey)

A group of handcuffed Iraqi detainees sit on the ground while being watched by the U.S. Army’s 1st Cavalry Division soldiers after being arrested for driving a stolen ambulance and testing positive for explosives on their hands in eastern Baghdad’s Shi’ite suburb al-Sadr City August 18, 2004. U.S. tanks entered Baghdad’s Shi’ite sprawling Sadr City slum on Wednesday and took positions in the main streets. U.S. tanks moved into the district of at least 2.5 million people early in the day to keep control of the fighters of the al-Mahdi Army in it’s stronghold. (REUTERS/David P. Gilkey/Pool)

BAGHDAD, IRAQ – AUGUST 14: Spec. Jeffrey Ward, a medic with the U.S. Armys 1st Cav, 1st Brigade, 112 Cav. from Fort Hood Texas, sits in the back of a pickup after trying to save a Iraqi man who was shot August 14, 2004 in Baghdad, Iraq. The man’s family was trying to transport him to a hosiptal after being wounded in clashes in a neighborhood outside of Sadr City. He died despite medical efforts by the soldiers. (Photo by David P. Gilkey-Pool/Getty Images)

U.S. Army’s 1st Cavalry Division sniper Aaron McAlister, from Maypearl Texas (L) and his counterpart Chuck Ayars, from Nashville Tennessee (C) take aim at a suspected enemy observer at Camp Eagle, outside the eastern Baghdad’s Shi’ite suburb of al-Sadr City August 16, 2004. Fresh fighting between U.S. forces and Sadr’s Mehdi militia broke out in a Shi’ite slum in Baghdad, witnesses said. They said U.S. troops were sealing off the area, called Sadr City. (REUTERS/Pool/David P. Gilkey)

Marines man their fighting hole near Camp Rhino in Southern
Afghanistan, December 9, 2001. The Marines are with Bravo Company of
the 15th Marine Expeditionary Unit from Camp Pendleton, California.
From left: Lance Corporal Bryce Collins of Juneau, Alaska, Corporal
David Lacerte of Montegut, Louisiana, Corporal Erasmo Cantu of Baytown,
Texas, and Corporal Brandon Gilkey of Huntington Beach, California.
(REUTERS/Dave Martin-POOL)

BAGHDAD, IRAQ: Soldiers with the US Army 1st Cav, 1st Brigade, 112 Cav. from Fort Hood, Texas, stop a pick-up truck with family members trying to get a critically wounded man to hospital from a neighborhood outside of Baghdad’s Sadr City slum after clashes with other soldiers just down the street 14 August 2004. The man had already died despite the efforts of the soldiers to give medical aid at the scene. (AFP PHOTO/David P. GILKEY/Pool (Photo: DAVID P. GILKEY/AFP/Getty Images)

Specialist Jeffrey Ward, of Arlington, Virginia, a medic with the U.S. Army’s 1st Cavalry Division, 1st Brigade, 1-12 Cav, stands guard in a haze of smoke outside a building during a cordon and search operation in a neighbourhood near the Baghdad suburb of al Sadr City August 15, 2004. Insurgents fired mortars at a meeting where Iraqi leaders met to pick an interim national assembly Sunday, killing at least two people in a grim reminder of the country’s tortured path toward democracy. (REUTERS/David P. Gilkey/Detroit Free Press/Knight Ridder-Pool)

U.S. Army troops from the U.S. Army’s 1st Cavalry Division, 1st Brigade, 1-12 Cav run into a building during a cordon and search operation in a neighbourhood near the Baghdad suburb of al Sadr City August 15, 2004. Insurgents fired mortars at a meeting where Iraqi leaders met to pick an interim national assembly Sunday, killing at least two people in a grim reminder of the country’s tortured path toward democracy. (REUTERS/David P. Gilkey/Detroit Free Press/Knight Ridder-Pool)

BAGHDAD, Iraq: Soldiers with the U.S. Army 1st Cavalry Division, 1st Brigade, 1-12 Cav. from Fort Hood, Texas, patrol the streets in M1-A1 Abrams tanks and Bradley fighting vehicles in Baghdad’s Sadr City slum 18 August 2004. (Photo: DAVID P. GILKEY/AFP/Getty Images)