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U.S. Lt. Col. Chad Carroll U.S. Lt. Col. Chad Carroll, media officer for the Combined Joint Task Force (CJTF) 1st Cavalry Division, salutes during a changing of command ceremony (AP Photo/Musadeq Sadeq)

Reflected in a mirror, Afghan National Army(ANA) female officers stand at attention in their barracks after their graduation ceremony from the Officer Candidate School at Kabul Military Training Center in Kabul, Afghanistan, Thursday, May 19, 2011. According to the ANA, this is the second class to graduate since the course was established in May 2010. Female officers graduate after a 20-week course including computer training, human resource training, English classes, and marksmanship. (AP Photo/Mustafa Quraishi)

An Afghan National Army (ANA) female officer stands in her barracks after her graduation ceremony from the Officer Candidate School at Kabul Military Training Center in Kabul, Afghanistan, Thursday, May 19, 2011. According to the ANA, this is the second class to graduate since the course was established in May 2010. Female officers graduate after a 20-week course including computer training, human resource training, English classes, and marksmanship. (AP Photo/Mustafa Quraishi)

Afghan National Army soldiers wait under a tree before a guard of honor ceremony to a visiting dignitary at Kabul Military Training Center in Kabul, Afghanistan, Thursday, May 19, 2011. (AP Photo/Mustafa Quraishi)

A female officer from Officer Candidate School at Kabul Military Training Centre stands next to her bed as high ranking officials from the defense ministry arrives to inspect the school after their graduation ceremony in Kabul May 19, 2011. The female officers graduated after a 20-week course including computer training, human resources training, English classes and marksmanship. Reuters/Ahmad Masood

Female officers from Officer Candidate School at Kabul Military Training Centre attend a graduation ceremony in Kabul May 19, 2011. The female officers graduated after a 20-week course including computer training, human resources training, English classes and marksmanship. Reuters/Ahmad Masood

A female officer from Officer Candidate School at Kabul Military Training Centre stands next to her bed as family members visit the school after her graduation ceremony in Kabul May 19, 2011. The female officers graduated after a 20-week course including computer training, human resources training, English classes and marksmanship. Reuters/Ahmad Masood

In this Dec. 29, 2010, file photo, Pakistani villagers carry the shrouded casket of a person reportedly killed by a US drone attack in Pakistani tribal area of Mir Ali along the Afghanistan border, during his funeral in Bannu, Pakistan. The Shamsi airfield in southwest Pakistan has become the centre of a political storm about Pakistan surrendering its sovereignty, as the airfield is suspected of housing U.S. drones used in missile strikes in Pakistan, but is actually under the control of the United Arab Emirates, although a UAE official has denied that the Gulf state has any operational role. (AP Photo/Ijaz Muhammad, file)

Local residents travel on top of a passenger bus on May 16, in Abbottabad. Pakistan received a total of $2.7 billion dollars in aid and reimbursements from Washington in fiscal year 2010, which ended on October 1, making it the third-largest recipient of US aid after Afghanistan and Israel. (AFP/File/Asif Hassan)

File photo of a detainee in Guantanamo Bay, Cuba. A 37-year old Afghan detainee died early at Guantanamo Bay in an apparent suicide, the US military said in a statement. (AFP/Getty Images/File/John Moore)

Osama Bin Laden is shown addressing a news conference in Afghanistan in this May 26, 1998 file photo. Al Qaeda released a posthumous audio recording by bin Laden posted on Jihadi websites, in which the Islamist group's ex-leader praised revolutions sweeping the Arab world. The SITE monitoring service reported on May 19, 2011 that the audio by bin Laden, who was killed in a U.S. raid on May 2 in Pakistan, was included in an Internet video lasting more than 12 minutes. Reuters/Stringer/Files

Afghans view the face of a protestor who was killed during a demonstration as he lies on a stretcher at the hospital in Taloqan, Takhar province, north of Kabul, Afghanistan on Wednesday, May 18, 2011. Hundreds of protesters, angered by an overnight NATO raid that they believed had killed four civilians, clashed on Wednesday with security forces on the streets of a northern Afghan city. Eleven people died in the fighting, government officials said. (AP Photo/Fulad Hamdard)

An Afghan policeman investigates next to a minibus which was hit a suicide bomber in Jalalabad May 18, 2011. A suicide bomber killed 13 people and wounded at least 20 in an attack on a minibus carrying police cadets in the main city in Afghanistan's east on Wednesday, a government spokesman said. Reuters/Parwiz

A wounded man is brought to a hospital after a suicide attack in Jalalabad May 18, 2011. A suicide bomber killed 13 people and wounded at least 20 in an attack on a minibus carrying police cadets in the main city in Afghanistan's east on Wednesday, a government spokesman said. Reuters/Parwiz

A U.S. soldier (L) keeps watch at the site of a suicide attack in Jalalabad May 18, 2011. A suicide bomber killed 13 people and wounded at least 20 in an attack on a minibus carrying police cadets in the main city in Afghanistan's east on Wednesday, a government spokesman said. Reuters/Parwiz

Afghan policemen carry a body away from the site of a suicide attack in Jalalabad May 18, 2011. A suicide bomber killed 13 people and wounded at least 20 in an attack on a minibus carrying police cadets in the main city in Afghanistan's east on Wednesday, a government spokesman said. Reuters/Parwiz

Afghan fire fighters work at the site of a suicide attack in Jalalabad May 18, 2011. A suicide bomber killed 13 people and wounded at least 20 in an attack on a minibus carrying police cadets in the main city in Afghanistan's east on Wednesday, a government spokesman said. Reuters/Parwiz

An unidentified U.S. soldier is seen at the scene of a suicide attack in Jalalabad, Nangarhar province, east of Kabul, Afghanistan on Wednesday, May 18, 2011. Afghan officials say at least 10 people have been killed in a bomb attack on a police bus that was carrying people to a police academy in eastern Afghanistan. (AP Photo/Rahmat Gul)

A burnt car is seen at the scene of a suicide attack in Jalalabad, Nangarhar province, east of Kabul, Afghanistan on Wednesday, May 18, 2011. Afghan officials say at least 10 people have been killed in a bomb attack on a police bus that was carrying people to a police academy in eastern Afghanistan. (AP Photo/Rahmat Gu

Afghan policemen investigate the wreckage of a bus, which was targeted by a suicide attacker in Jalalabad, Nangarhar province, east of Kabul, Afghanistan on Wednesday, May 18, 2011. Afghan officials say at least 10 people have been killed in a bomb attack on a police bus that was carrying people to a police academy in eastern Afghanistan. (AP Photo/Rahmat Gul)

Afghans try to carry a victim from the scene of a suicide attack in Jalalabad, Nangarhar province, east of Kabul, Afghanistan on Wednesday, May 18, 2011. Afghan officials say at least 10 people have been killed in a bomb attack on a police bus that was carrying people to a police academy in eastern Afghanistan. (AP Photo/Rahmat Gul)

Afghans carry a victim of bomb attack in Jalalabad, Nangarhar province, east of Kabul, Afghanistan on Wednesday, May 18, 2011. Afghan officials say at least 10 people have been killed in a bomb attack on a police bus that was carrying people to a police academy in eastern Afghanistan. (AP Photo/Rahmat Gul)

Afghans try to carry a wrapped victim of bomb attack in Jalalabad, Nangarhar province, east of Kabul, Afghanistan on Wednesday, May 18, 2011. Afghan officials say at least 10 people have been killed in a bomb attack on a police bus that was carrying people to a police academy in eastern Afghanistan. (AP Photo/Rahmat Gul)

Afghans stand around the wrapped bodies of Afghans, allegedly killed in a NATO raid, during an anti- US demonstration in Taloqan, Takhar province, north of Kabul, Afghanistan on Wednesday, May 18, 2011. More than 1,000 protesters poured into a northern Afghan city Wednesday, shouting 'Death to America!' and calling for justice as they clashed with security forces following an overnight NATO raid they claim killed four civilians. (AP Photo/Fulad Hamdard)

The Arab Revolution of 2011