An Iraqi man prays in 2015 for his slain relative, at the site of a mass grave, believed to contain the bodies of Iraqi soldiers killed by Islamic State group militants when they overran Camp Speicher military base, in Tikrit, Iraq. Khalid Mohammed/AP hide caption

toggle caption Khalid Mohammed/AP

Passengers leave Istanbul Ataturk, Turkey's largest airport, after a suicide bomb attack Tuesday killed at least 42 people and wounded more than 230 people. Defne Karadeniz/Getty Images hide caption

toggle caption Defne Karadeniz/Getty Images

U.S. Envoy: 'We're Taking Out' About 1 ISIS Leader Every 3 Days

  • Download
  • <iframe src="https://www.npr.org/player/embed/484058317/484058318" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

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

toggle caption Courtesy of Christian Macedonia

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

  • Download
  • <iframe src="https://www.npr.org/player/embed/481568316/481590439" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript
Katherine Du/NPR

Kit Parker's Story Part I

  • Download
  • <iframe src="https://www.npr.org/player/embed/480608042/487303128" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Supporters of Iraqi cleric Muqtada al-Sadr chant slogans after breaking into Baghdad's fortified Green Zone on Friday. Ahmad al-Rubaye /AFP/Getty Images hide caption

toggle caption Ahmad al-Rubaye /AFP/Getty Images

U.S. Navy air wing captains pause on the flight deck of the aircraft carrier USS Theodore Roosevelt last September. Every day, the steam-powered catapult aboard this massive ship flings American fighter jets into the sky, on missions to target the extremist Islamic State group in Iraq and Syria. Marko Drobnjakovic/AP hide caption

toggle caption Marko Drobnjakovic/AP

Kurdish Regional Government Peshmergas attend a military training exercise conducted by U.S.-led coalition trainers at the Bnaslawa military training camp in Irbil, Iraq, in March. Yunus Keles/Anadolu Agency/Getty Images hide caption

toggle caption Yunus Keles/Anadolu Agency/Getty Images