A U.S. soldier is brought to the emergency room at the U.S. hospital at Bagram Air Field, north of Kabul, after he was wounded by a roadside bomb in Wardak province, June 2009. The facility uses both cutting-edge technology as well as old techniques discovered anew to treat the massive number of wounded soldiers who pass through. Rafiq Maqbool/AP hide caption

itoggle caption Rafiq Maqbool/AP

Army medics and soldiers carry a wounded soldier onto an Air Force C-17 at Bagram Air Field in this Aug. 8, 2002, photo. Members from the Aeromedical Evacuation Squadron at Bagram quickly reconfigure the hold of the massive cargo plane into a flying hospital that will take wounded troops from the war zone to American hospitals in Europe and the United States. Wally Santana/Pool/Getty Images hide caption

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An Afghan Shiite Muslim prays in a mosque in Kabul this week, during ceremonies in remembrance of the martyrdom of Imam Hussein, the grandson of the Prophet Muhammad. Afghan Shiites are almost all ethnic Hazaras, who make up about 10 percent of the population and have historically been considered a subservient class in Afghanistan and persecuted by the Taliban. Rafiq Maqbool/AP hide caption

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Children and an Afghan policeman look at a U.S. soldier patrolling the outskirts of Kandahar. President Obama's review of U.S. policy in Afghanistan will be unveiled soon. Although the administration is formulating an exit strategy, Afghans and other observers say it would be a  mistake for the U.S. to leave the country in its current state. Rodrigo Abd/AP hide caption

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In October, soldiers with the 101st Airborne Division on patrol in eastern Afghanistan's Kunar province climb the hills and footpaths near the Pakistan border. This volatile border has been a source of constant friction as insurgents pass freely through the mountainous region. David Gillkey/NPR hide caption

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Army Lt. Kenneth Kovach speaks to members of Pakistan's paramilitary Frontier Corps over coils of concertina wire that separate Afghanistan and Pakistan. David Gilkey/NPR hide caption

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A man holds the keys to his car while yelling for customers to catch a ride with him to Jalalabad in eastern Afghanistan and the border crossing at the Khyber Pass. David Gilkey/NPR hide caption

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Workers shift ballot boxes at the Independent Election Commission warehouses on Sept. 23 in Kabul, Afghanistan. The Electoral Complaints Commission has received vast amounts of complaints alleging fraud. Paula Bronstein /Getty Images hide caption

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Women have been flying Apache attack helicopters in the U.S. Army for about 15 years. Chief Warrant Office Stephanie Rose was among the first women to fly the Apache and is currently on her third combat tour, this time in northern Afghanistan. Yuri Cortez/Getty Images hide caption

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Villagers shout anti-U.S. slogans after a U.S.-led raid in Wardak, Afghanistan, that killed three civilians two weeks ago. A crowd of about 300 villagers yelled "Death to the United States" and blocked a main road in eastern Afghanistan. Rahmatullah Naikzad/AP hide caption

itoggle caption Rahmatullah Naikzad/AP

Women walk at an outdoor market in downtown Kabul. The resurgent Taliban and several recent executions in accordance with an extreme interpretation of Shariah law have human-rights activists worried, particularly for women. Rodrigo Abd/AP hide caption

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Hall rests during a recent patrol in Ali Abad, in northern Afghanistan, with a platoon of soldiers who live with the Afghan national police. Quil Lawrence/NPR hide caption

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