An Afghan policeman searches a man at a checkpoint where a NATO soldier was stabbed to death in Kabul on Aug. 20. As U.S. and NATO troops are drawing down in Afghanistan, the Taliban have been stepping up attacks this summer. Shah Marai/AFP/Getty Images hide caption

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A construction excavator demolishes a B-hut at the huge Bagram Air Field north of Kabul. The military used the structures as bunks and offices during the 13-year war but is tearing them down as most of the military prepares to leave by year's end. Sean Carberry/NPR hide caption

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Secretary of State John Kerry and Afghanistan's presidential candidates, Ashraf Ghani (center) and Abdullah Abdullah (right), announce a deal in Kabul on July 12 to audit all Afghan election votes. Kerry returned last week and both candidates reaffirmed their commitment to the audit. Jim Bourg/AP hide caption

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At the Romez Store in Kabul, brides-to-be can place custom orders for dresses costing upwards of $900, which is three times the average monthly wage in Afghanistan. Sean Carberry/NPR hide caption

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U.S. Maj. Gen. Harold Greene was visiting an Afghan military training academy Tuesday when he was shot dead by an Afghan soldier, who was subsequently killed. Afghan troops who knew the attacker say he disliked the Taliban and they aren't sure what his motive was. U.S. Army/Getty Images hide caption

itoggle caption U.S. Army/Getty Images