Afghan police train with their weapons in Lashkar Gah, Afghanistan, in July. Hundreds of U.S. troops are deployed to train and assist security forces in Helmand province, where the Taliban have recently made territorial gains. Abdul Khaliq/AP hide caption

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Afghan police inspect the site in in Kabul, Afghanistan, where a bus convoy was attacked on Thursday. The buses carrying police cadets were targeted as they were on their way from the neighboring Maidan Wardak province to Kabul. Anadolu Agency/Getty Images hide caption

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A member of the Afghan army looks on as an artillery gun fires at Taliban fighters in the hills of Nangahar Province, in eastern Afghanistan, in 2015. NPR photographer David Gilkey, who was killed Sunday, embedded with the Afghan military on multiple occasions to see how it was faring in its fight against the Taliban. David Gilkey/NPR hide caption

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An Afghan commando stands on the tarmac, wearing night vision gear. The elite commandos are about to fly into an area controlled by Taliban fighters. Their mission: to sweep a village for Taliban fighters. David Gilkey/NPR hide caption

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Under U.S. Air Cover, Afghan Commandos Chase The Elusive Taliban

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Volunteers stand Saturday near the wreckage of the destroyed vehicle, in which Mullah Akhtar Mansour was allegedly traveling in the Ahmed Wal area in Baluchistan province of Pakistan, near Afghanistan border. Abdul Malik/AP hide caption

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U.S. Drone Strike Killed Taliban Leader, White House, Afghan Government Say

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Five-year-old Murtaza Ahmadi, an avid Lionel Messi fan from Afghanistan, poses in a signed jersey from the Argentinian soccer great on Feb. 26. The boy's father says the media coverage led to threats toward the family. Rahmat Gul/AP hide caption

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