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A US soldier is seen on patrol in the Rushdie Mullah area of Yusufiyah, south of Baghdad in March, 2008. The Iraq invasion rallied untold numbers of new jihadist fighters to the cause, and the country proved an ideal training ground for militants to hone their skills against the most well-equipped army in the world. (AFP/File/Ali Yussef)

Grieving family members of Pfc. Antonio G. Stiggins gather around his casket upon the deceased soldiers' arrival at Great Southwest Aviation in Roswell, N.M, Saturday, April 30, 2011. Stiggins, 25, died of wounds suffered April 22, in Numaniyah, Iraq. (AP Photo/Roswell Daily Record Mark Wilson)

The U.S. Army Honor Guard transfer the remains of Pfc. Antonio G. Stiggins to an awaiting hearse upon the deceased soldiers' arrival at Great Southwest Aviation in Roswell, N.M, Saturday, April 30, 2011. Stiggins, 25, died of wounds suffered April 22, in Numaniyah, Iraq. (AP Photo/Roswell Daily Record Mark Wilson

A demonstration in Baghdad's Tahrir Square on April 29. Insurgents bombed an Iraqi judge's home, killing him and at least one of his children on Saturday, while a suicide blast in the north of the country killed seven people, including four soldiers. (AFP/File/Ali al-Saadi)

A US soldier stands guard during the start of the Lion's Leap Operation, a joint US-Iraqi service exercise to demonstrate the Iraqi Security Forces' ability to provide for the security of the Iraqi people. The killing of an American soldier made April the deadliest month for US forces in Iraq since 2009, according to figures compiled by AFP. (AFP/File/Ahmad al-Rubaye)

*Brig. Gen. Gracus Dunn talks Ashley Hudguns, widow of Army Staff Sergeant Quadi S. Hudgins, of New Orleans, Friday, April 29, 2011, during burial services at Arlington National Cemetery in Arlington, Va. The Defense Department says Hudgins died earlier this month after coming under attack in Babil, Iraq. (AP Photo/Alex Brandon)

Army Secretary John McHugh talks with Ashley Hudgins, widow of Army Staff Sergeant Quadi S. Hudgins, of New Orleans, during burial services at Arlington National Cemetery in Arlington, Va. The Defense Department says Hudgins died earlier this month after coming under attack in Babil, Iraq. (AP Photo/Alex Brandon)

Charles Hudgins, grandfather of Army Staff Sergeant Quadi S. Hudgins, of New Orleans, second from left, accompanied by widow Nyima Hudgins, third form left, and mother Katrina Hudgins, seated, attend burial service at Arlington National Cemetery in Arlington, Va., Friday, April 29, 2011, The Defense Department says Hudgins died earlier this month after coming under attack in Babil, Iraq. (AP Photo/Alex Brandon)

The Casket Team carries the remains of Army Staff Sergeant Quadi S. Hudgins of New Orleans, Friday, April 29, 2011, at Arlington National Cemetery in Arlington, Va. The Defense Department says Hudgins died earlier this month after coming under attack in Babil, Iraq. (AP Photo/Alex Brandon)

The firing party eject the empty shells after firing one volley of three, during the burial service for Army Staff Sergeant Quadi S. Hudgins of New Orleans, Friday, April 29, 2011, at Arlington National Cemetery in Arlington, Va. The Defense Department says Hudgins died earlier this month after coming under attack in Babil, Iraq. (AP Photo/Alex Brandon)

The horse drawn caisson carries the remains of Army Staff Sergeant Quadi S. Hudgins, of New Orleans, Friday, April 29, 2011, at Arlington National Cemetery in Arlington, Va. The Defense Department says Hudgins died earlier this month after coming under attack in Babil, Iraq. (AP Photo/Alex Brandon)

Nymia Hudgins, touches the casket of her father, Army Staff Sergeant Quadi S. Hudgins, of New Orleans, Friday, April 29, 2011, during burial services at Arlington National Cemetery in Arlington, Va. The Defense Department says Hudgins died earlier this month after coming under attack in Babil, Iraq. (AP Photo/Alex Brandon)

A US soldier patrols a town in Diyala province., close to the border with Iran in 2009. A Sunni imam's family and four Sunni brothers were killed in separate incidents in central Iraq, hours after a suicide bomber killed 10 Shiite worshippers at a nearby mosque. (AFP/File/Filippo Monteforte)

Families chant anti-Iraqi government slogan as they carry pictures of detainees and missing persons during a protest in Baghdad, Iraq, Friday, April 29, 2011. Tens of Iraqis protested in Tahrir Square demanding the withdrawal of the American forces from Iraq, fighting rampant corruption and releasing of prisoners. (AP Photo/Hadi Mizban)

A protester holds a defaced poster of Iraqi Prime Minister Nouri al-Maliki during a protest in Baghdad, Iraq, Friday, April 29, 2011. Tens of Iraqis protested in Tahrir Square demanding the withdrawal of the American forces from Iraq, fighting rampant corruption and releasing of prisoners. The sentence in Arabic reads: 'No, no to corruption.' (AP Photo/Hadi Mizban)

This undated photo released Thursday, April 28, 2011, by the U.S. Marine Corps in Camp Lejeune, N.C., shows Sgt. David P. Day, 26, of Gaylord, Mich. The Pentagon says Day died April 24 in Badghis province of Afghanistan during combat operations. Day joined the corps in 2003 and served tour tours of duty in Iraq before being deployed to Afghanistan. (AP Photo/U.S. Marine Corps)

Iraqi soldiers look at the debris of a Shiite Muslim mosque following a suicide bombing in Baladruz in 2005. A suicide bomber killed 10 people as he blew himself up inside a Shiite mosque in Baladruz on Thursday, as nationwide violence left 16 dead, including senior police and army officers. (AFP/File/Ali Yussef)

Policewomen march during a training course at a police academy in Kerbala, 80 km (50 miles) southwest of Baghdad April 27, 2011. About 50 policewomen took part in a 45-day basic training course, a police commander in Kerbala said on Wednesday. Reuters/Mushtaq Muhammed

A veiled policewoman dismantles a rifle during a training course at a police academy in Kerbala, 80 km (50 miles) southwest of Baghdad April 27, 2011. About 50 policewomen took part in a 45-day basic training course, a police commander in Kerbala said on Wednesday. Reuters/Mushtaq Muhammed

Policewomen practise assembling and disassembling Kalashnikov automatic rifles during a training course at a police academy in Kerbala, 80 km (50 miles) southwest of Baghdad April 27, 2011. About 50 policewomen took part in a 45-day basic training course, a police commander in Kerbala said on Wednesday. Reuters/Mushtaq Muhammed

Policewomen practise assembling and disassembling a Kalashnikov automatic rifle during a training course at a police academy in Kerbala, 80 km (50 miles) southwest of Baghdad April 27, 2011. About 50 policewomen took part in a 45-day basic training course, a police commander in Kerbala said on Wednesday. Reuters/Mushtaq Muhammed

An Army carry team moves a transfer case containing the remains of 1st Lt. Omar J. Vasquez as a transfer case containing the remains of Pfc. Antonio G. Stiggins sits on a plane at Dover Air Force Base, Del., Monday, April 25, 2011. According to the Department of Defense, Vasquez, 25, of Hamilton, N.J., and Stiggins, 25, of Rio Rancho, N.M., died of wounds sustained April 22, 2011, in Numaniyah, Iraq when insurgents attacked their unit with an improvised explosive device. (AP Photo/Steve Ruark)

An Army carry team moves a transfer case containing the remains of 1st Lt. Omar J. Vasquez at Dover Air Force Base, Del., Monday, April 25, 2011. According to the Department of Defense, Vasquez, 25, of Hamilton, N.J., died of wounds sustained April 22, 2011 in Numaniyah, Iraq when insurgents attacked his unit with an improvised explosive device. (AP Photo/Steve Ruark)

The Arab Revolution of 2011