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An Army carry team lifts a transfer case containing the remains of Pfc. Antonio G. Stiggins at Dover Air Force Base, Del., Monday, April 25, 2011. According to the Department of Defense, Stiggins, 25, of Rio Rancho, N.M., died of wounds sustained April 22, 2011, in Numaniyah, Iraq when insurgents attacked his unit with an improvised explosive device. (AP Photo/Steve Ruark)

Transfer cases containing the remains of Pfc. Antonio G. Stiggins, left, and 1st Lt. Omar J. Vasquez sit in a plane during a prayer at Dover Air Force Base, Del., Monday, April 25, 2011. According to the Department of Defense, Stiggins, 25, of Rio Rancho, N.M., and Vasquez, 25, of Hamilton, N.J., 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 lifts a transfer case containing the remains of Pfc. Antonio G. Stiggins at Dover Air Force Base, Del., Monday, April 25, 2011. According to the Department of Defense, Stiggins, 25, of Rio Rancho, N.M., died of wounds sustained April 22, 2011, in Numaniyah, Iraq when insurgents attacked his unit with an improvised explosive device. (AP Photo/Steve Ruark)

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

A helicopter belonging to the US private security company Blackwater flies over Baghdad in 2004. A US appeals court has reopened the prosecution of four former Blackwater security guards accused of killing 14 Iraqi civilians in 2007, documents obtained by AFP Sunday showed. (AFP/File/Patrick Baz)

A wounded policeman stands near another lying on a hospital bed in Baghdad April 24, 2011 in this still image taken from video. Reuters/Reuters TV

Medics clean the wound of an injured policeman at a hospital in Baghdad April 24, 2011 in this still image taken from video. A roadside bomb exploded near the rear entrance of a Catholic church in Baghdad after Easter services on Sunday, wounding at least two police officers and two civilians. The bomb blew up outside Sacred Heart church in Baghdad's central Karrada district, shattering windows in nearby buildings and severely damaging a police pick-up truck at the church gate. Reuters/Reuters TV

Residents attend Easter mass inside the Sacred Heart Catholic church in Baghdad April 24, 2011. A roadside bomb exploded near an entrance of the Sacred Heart Catholic church in Baghdad after the mass on Sunday, wounding two police officers and two civilians, an Interior Ministry source said. Reuters/Saad Shalash

A man dressed as a U.S. soldier pretends to be detained by supporters of Shi'ite cleric Moqtada al-Sadr during a parade near Sadr's office in Iraq's southern province of Basra, 420 km (260 miles) southeast of Baghdad April 21, 2011. Reuters/Atef Hassan

Residents walk on an Israeli flag during a parade for supporters of Shi'ite cleric Moqtada al-Sadr in Baghdad's northwestern Shulla district April 23, 2011. Reuters/Saad Shalash

A policeman clashes with a man as he tries to arrest him during a protest in Baghdad, Iraq, Friday, April 22, 2011. Tens of Iraqis protested in Tahrir Square demanding the withdrawal of the American forces from Iraq, fighting rampant corruption and releasing of prisoners. Police allege that the man was a thief. (AP Photo/Khalid Mohammed)

A rebel fighter celebrates as his comrades fire a rocket barrage toward troops loyal to Gaddafi, April 14, 2011, west of Ajdabiyah. In 2006 Chris Hondros won the Robert Capa Gold Medal -- war photography's highest honor -- for his work in Iraq. Chris Hondros/Getty Images

An Iraqi soldier secures the scene of a suicide car bomb in Baghdad, Iraq, Monday, April 18, 2011. Suicide bombers detonated two explosives-packed cars Monday outside Baghdad's heavily fortified Green Zone, killing and wounding several of people, police said. (AP Photo)

In this March 23, 2011 photo, U.S. troops stand guard outside a local journalists' union office in Basra, Iraq. As the U.S. tries to move from invading power to normal diplomatic partner and the last American troops obligated to be gone by year's end, the protection of American diplomats will fall almost entirely to private contractors and Iraqi security forces. (AP Photo/Nabil al-Jurani)

Defense Secretary Robert Gates talks with reporters after meeting with soldiers from the 4th Advise and Assist Brigade, 1st Calvalry Division out of Fort Hood, Texas, Friday, April 8, 2011, at Camp Marez in Mosul, Iraq. (AP Photo/Chip Somodevilla, Pool)

Chaplain Col. Scott H. Jenssen direct aprayer over the transfer cases containing the remains of Army 1st Lt. Robert F. Welch III of Denton, Texas, Army Sgt. Christian A. Garcia of Goodyear, Arizona, Army Sgt. Quadi S. Hudgins of New Orleans, La, and Army Sgt. Jorge A. Scatliffe of St. Croix, U.S. Virgin Islands, upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Sgt. Garcia, Sgt. Hudgins and Scatliffe who was supporting Operation New Dawn in Iraq and !st Lt. Welch III who was supporting Operation Enduring Freedom in Afghanistan. (AP Photo/Jose Luis Magana)

An Army carry team carries the transfer case containing the remains of Army Sgt. Jorge A. Scatliffe of St. Croix, U.S. Virgin Islands, upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Army Sgt. Jorge A. Scatliffe who was supporting Operation New Dawn in Iraq. (AP Photo/Jose Luis Magana)

The transfer cases containing the remains of Army 1st Lt. Robert F. Welch III of Denton, Texas, Army Sgt. Christian A. Garcia of Goodyear, Arizona, Army Sgt. Quadi S. Hudgins of New Orleans, La, and Army Sgt. Jorge A. Scatliffe of St. Croix, U.S. Virgin Islands, sit at the end of the ramp loader are reflected in a glass upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Sgt. Garcia, Sgt. Hudgins and Scatliffe who was supporting Operation New Dawn in Iraq and !st Lt. Welch III who was supporting Operation Enduring Freedom in Afghanistan. (AP Photo/Jose Luis Magana)

An Army carry team carries the transfer case containing the remains of Army Sgt. Quadi S. Hudgins of New Orleans, La., upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Army Sgt. Quadi S. Hudgins who was supporting Operation New Dawn in Iraq. (AP Photo/Jose Luis Magana)

The transfer cases containing the remains of Army 1st Lt. Robert F. Welch III of Denton, Texas, Army Sgt. Christian A. Garcia of Goodyear, Arizona, Army Sgt. Quadi S. Hudgins of New Orleans, La, and Army Sgt. Jorge A. Scatliffe of St. Croix, U.S. Virgin Islands, sit at the end of the ramp loader upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Sgt. Garcia, Sgt. Hudgins and Scatliffe who was supporting Operation New Dawn in Iraq and !st Lt. Welch III who was supporting Operation Enduring Freedom in Afghanistan. (AP Photo/Jose Luis Magana)

An Army carry team carries the transfer case containing the remains of Army Sgt. Christian A. Garcia of Goodyear, Arizona, upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Army Sgt. Christian A. Garcia who was supporting Operation New Dawn in Iraq. (AP Photo/Jose Luis Magana)

An Air Force carry team carries the transfer case containing the remains of Army Sgt. Jorge A. Scatliffe of St. Croix, U.S. Virgin Islands, upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Army Sgt. Jorge A. Scatliffe who was supporting Operation New Dawn in Iraq. (AP Photo/Jose Luis Magana)

An Army carry team carries the transfer case containing the remains of Army Sgt. Quadi S. Hudgins of New Orleans, La., upon arrival at Dover Air Force Base, Del. on Tuesday, April 5, 2011. The Department of Defense announced the death of Army Sgt. Quadi S. Hudgins who was supporting Operation New Dawn in Iraq. (AP Photo/Jose Luis Magana)

U.S. Army soldiers and Iraqi security forces stand guard at the scene of a roadside bomb attack that exploded in Najaf, 160 kilometers (100 miles) south of Baghdad, Iraq Sunday, April 3, 2011. (AP Photo/Alaa al-Marjani)

An Afghan policeman is seen through the window of a burnt vehicle at the compound of UN's office, which was put on fire on Friday during a demonstration to condemn the burning of a copy of the Muslim holy book by a U.S. Florida pastor, in Mazar-i- Sharif north of Kabul, Afghanistan, on Saturday, April. 2, 2011. Afghans angry over the burning of a Quran at a small Florida church stormed a U.N. compound in northern Afghanistan on Friday, killing seven foreigners, including four Nepalese guards. (AP Photo/Mustafa Najafizada)

The Arab Revolution of 2011