Afghan security forces rush to respond to an attack on the campus of American University of Kabul on Wednesday. "We are trying to assess the situation," President Mark English told The Associated Press. Rahmat Gul/AP hide caption

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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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Micah Johnson, who authorities have identified as the shooter who killed five law enforcement officers in Dallas on July 7 during a protest over recent fatal police shootings of black men. AP hide caption

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Ameera, 6, walks with assistance at the Craig Joint Theater Hospital at Bagram Airfield, Afghanistan. She is recovering from a gunshot wound sustained when she was caught in a firefight between U.S. and Afghan soldiers and Taliban insurgents. Senior Airman Robert Dantzler/U.S. Air Force hide caption

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Ameera, A 6-Year-Old Afghan, Prepares To Walk Out Of U.S. Military Hospital

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An Afghan protester screams near the scene of a suicide attack that targeted crowds of minority Shiite Hazaras during a demonstration in Kabul on Saturday. Wakil Kohsar /AFP/Getty Images hide caption

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An Afghan soldier stands at a mortar training range near Kandahar, Afghanistan. The Afghan forces are still receiving help from the U.S. as they battle the Taliban. This photo was taken by NPR's David Gilkey shortly before he was killed by the Taliban on June 5. David Gilkey/NPR hide caption

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Afghanistan: A Tragic Return To A War With No End

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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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The Gray Team with Maj. Jennifer Bell (center), who ran a concussion clinic, seen in the Helmand province of Afghanistan in 2010: Col. Michael Jaffee (from left) , Capt. James Hancock, Col. Geoffrey Ling, Lt. Col. Shean Phelps and Col. Robert Saum. Courtesy of Christian Macedonia hide caption

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How A Team Of Elite Doctors Changed The Military's Stance On Brain Trauma

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Kit Parker's Story Part I

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David Gilkey is seen in 2013 at NPR's Afghanistan bureau as he started a month in the country. David wore silver bracelets on his wrist as a kind of good luck charm. He said every time he had a near-death experience, he let one go. He threw one into the Euphrates River after the second battle of Fallujah. Another went into the Helmand River after he covered the arrival of U.S. Marines in 2009. Graham Paul Smith/NPR hide caption

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David Gilkey Was 'An Incredibly Thoughtful' Photographer In The Midst Of Plight

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