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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Anadolu Agency/Getty Images

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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David Gilkey/NPR

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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David Gilkey/NPR

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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Abdul Malik/AP

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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Rahmat Gul/AP

Army Sgt. Bowe Bergdahl leaves a military courthouse Tuesday in Fort Bragg, N.C. Bergdahl was arraigned on charges of desertion and endangering troops stemming from his decision to leave his outpost in Afghanistan in 2009. Sara D. Davis/Getty Images hide caption

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Sara D. Davis/Getty Images

The damaged hospital in which the Doctors Without Borders medical charity operated is seen following a U.S. airstrike in the northern city of Kunduz. STR/AFP/Getty Images hide caption

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STR/AFP/Getty Images