Pakistani tribesmen carry a casket of a victim of NATO oil tanker explosion for a funeral prayer in Landi Kotal near Afghan border in Pakistan on Saturday, May 21, 2011. A tanker carrying oil for NATO forces in Afghanistan exploded Saturday in northwestern Pakistan as people tried to siphon off some of its fuel, an official said. (AP Photo/Qazi Rauf)
Afghans hold the body of one of four people killed during a NATO raid in Taloqan, Takhar province, north of Kabul, Afghanistan, on Wednesday, May 18, 2011. More than 1,000 protesters shouted, "Death to America!" and called for justice as they clashed with security forces following the raid. (AP Photo/Fulad Hamdard)
ASSOCIATED PRESS
Afghan soldiers and U.S. soldiers with the NATO-led International Security Assistance Force check inside the Traffic Department building, a Taliban stronghold, after a two-day assault in Kandahar, south of Kabul, on Monday.
Afghan and U.S. soldiers with the NATO-led International Security Assistance Force (ISAF) check inside the Traffic Department building, a Taliban stronghold, on Monday, May 9, 2011, after a two-day assault in Kandahar, Afghanistan, south of Kabul. (AP Photo/Allauddin Khan)
In this photo taken on a government-organized tour, Libyan government officials and the media move through the ruins of an official building following a NATO airstrike in Tripoli, Libya, early on Tuesday, May 10, 2011. (AP Photo/Darko Bandic)
** FILE ** Holding a poster of their leader, supporters of Moammar Gadhafi chant slogans following a NATO airstrike in Tripoli, Libya, early Saturday, April 23, 2011. (AP Photo/Darko Bandic)
Two Afghan boys walk near the military base (background) where a suicide bomber wearing an Afghan security-forces uniform blew himself up at the entrance in the eastern Afghan province of Laghman, killing NATO and Afghan soldiers, on Saturday, April 16, 2011. (AP Photo/Rahmat Gul)
Libyan rebel fighters fire rockets in the desert between Ajdabiya and Brega on Saturday. The rebels said NATO airstrikes Sunday helped them drive Col. Moammar Gadhafi's forces out of Ajdabiya, the gateway to the opposition's stronghold. (Associated Press)
A Libyan rebel reacts Thursday after hearing claims that a NATO airstrike had hit rebel forces accidentally, killing at least two and injuring more than a dozen. (Associated Press)
Libyan rebels, at the west gate of Ajdabiya, Libya, express their anger on hearing claims from fellow fighters that a NATO airstrike further up the road toward Brega had hit rebel forces, killing at least five and injuring more than 20 others, on Thursday, April 7, 2011. (AP Photo/Ben Curtis)
One Libyan rebel keeps a lookout as others inspect two destroyed vehicles of pro-Gadhafi forces that rebels claim were targeted by a NATO strike Tuesday on the front line near Brega. Libya's rebel forces are looking more effective on the front and recovering some territory lost to Moammar Gadhafi's army. (Associated Press)
A Danish F-16 jet fighter takes off from the NATO air base in Sigonella, Italy, on Wednesday, March 23, 2011. NATO warships began patrolling off Libya's coast on Wednesday to enforce the U.N. arms embargo as the alliance appeared set to assume responsibility for maintaining the no-fly zone over the country, officials said. (AP Photo/Andrew Medichini)
U.S. Army Gen. David H. Petraeus, commander of U.S. and NATO forces in Afghanistan, arrives on Capitol Hill in Washington on Tuesday, March 15, 2011, to testify before the Senate Armed Services Committee on the situation in Afghanistan. At left is Defense Under Secretary for Policy Michele Flournoy. (AP Photo)
U.S. Army Gen. David H. Petraeus, commander of U.S. and NATO forces in Afghanistan, testifies Tuesday on Capitol Hill before the Senate Armed Services Committee. (Associated Press)
An Afghan youth looks at the damage caused during a NATO raid in the Khogyani district of Nangarhar province, east of Kabul, Afghanistan, on Monday, Feb. 21, 2011. The NATO coalition says it is investigating the accidental death of Afghan civilians in Nangarhar province along the Pakistan border. (AP Photo)
U.S. Lt. Gen. William Caldwell, the commander of NATO's mission to train Afghan policemen and soldiers, speaks with the Associated Press in Kabul, Afghanistan, on Saturday, Feb. 12, 2011. Gen. Caldwell said more nations are pledging support, yet the coalition still faces a shortage of 740 trainers needed to get the Afghan security forces ready to take the lead in securing their nation by the end of 2014. (AP Photo/Dar Yasin)
Vice President Joseph R. Biden Jr. (right) speaks with Gen. David H. Petraeus, the top U.S. and NATO commander in Afghanistan, during a press event in Kabul, Afghanistan, on Monday, Jan. 10, 2011. Mr. Biden is in Afghanistan on a surprise visit to assess progress in handing over security from foreign to Afghan forces. (AP Photo/Musadeq Sadeq)
Helmand's Gov. Gulab Mangal, left, shakes hand with U.S. Gen. David Petraeus, NATO's top commander in Afghanistan, in Lashkar Gah, Helmand province, south of Kabul, Afghanistan, Monday, Jan. 10, 2011. (AP Photo/Heidi Vogt)