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

itoggle caption Wally Santana/Pool/Getty Images

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

itoggle caption Rafiq Maqbool/AP

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

itoggle caption Rodrigo Abd/AP

Soldiers from the Army's 101st Airborne Division walk along high mud walls in a village in Afghanistan's Kandahar province. The Obama administration later this month will release its annual review of the war strategy. Afghanistan's history does not offer encouragement. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

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

itoggle caption David Gillkey/NPR

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

itoggle caption David Gilkey/NPR