Workers excavate remains from a mass grave in the desert of western Anbar province in Iraq on April 14. The mass grave holds the remains of more than 800 people, believed to have been killed during the rule of ousted leader Saddam Hussein. Ali Mashhadani/Reuters/Landov hide caption

itoggle caption Ali Mashhadani/Reuters/Landov

Ahmed Chalabi, shown in May 2010, says Iraq should lead the way toward democratic change in the region. But some say he may be playing a dangerous game. Karim Kadim/AP hide caption

itoggle caption Karim Kadim/AP

U.S. Defense Secretary Robert Gates talks with troops from the U.S. Army 25th Infantry Division from Hawaii during a visit at Camp Victory in Baghdad on Thursday. Chip Somodevilla/AP hide caption

itoggle caption Chip Somodevilla/AP

Maj. Gen. Claudio Angelelli addresses oil police recruits after their first run-through exercise to clear a building of hostage-takers. Angelelli is the commander of the Italian Carabinieri unit in Iraq that is training the oil police. Courtesy of NATO Training Mission in Iraq hide caption

itoggle caption Courtesy of NATO Training Mission in Iraq

People inspect a destroyed car in front of a provincial council building in Tikrit, 80 miles north of Baghdad, on Wednesday. A small squad of insurgents attacked the building Tuesday, leaving 57 people dead. Karim Kadim/AP hide caption

itoggle caption Karim Kadim/AP

T-6 planes for pilot training fly over the Iraqi Air Force academy during its reopening ceremony north of Tikrit in December 2009. AFP/Getty Images hide caption

itoggle caption AFP/Getty Images