U.S. soldiers stand at a checkpoint around Lakokhel camp in Afghanistan in 2010. Many soldiers return from war suffering from "moral injuries," or dealing with the fact that their sense of right and wrong was violated. Martin Bureau/AFP/Getty Images hide caption

itoggle caption Martin Bureau/AFP/Getty Images

Former Army Sgt. Ryan Sharp sat down with his father, Kirk Sharp, to talk about what happened when Ryan returned home after two tours in Iraq. StoryCorps hide caption

itoggle caption StoryCorps

Shirley Parrello's son, Brian, died in Iraq almost ten years ago. Sgt. Kevin Powell was with him that day, and he says he can still picture Brian Parello in the moments after the IED exploded. Storycorps hide caption

itoggle caption Storycorps

When Sgt. Paul Braun (right) first met Philip, the Iraqi interpreter assigned to his company, he didn't trust him. But after his tour was over, he worked for years to get Philip a visa to come to the U.S. Storycorps hide caption

itoggle caption Storycorps

Paul Pillar (right), a former national intelligence officer, with teammate Aaron David Miller, argues that the U.S. should have a smaller military footprint in the Middle East. Samuel LaHoz/Intelligence Squared U.S. hide caption

itoggle caption Samuel LaHoz/Intelligence Squared U.S.

Plaster casts taken from soldiers' mutilated faces (top row), new sculpted faces (bottom row), and final masks (on the table) sit in the studio of Anna Coleman Ladd in 1918. American Red Cross/Anna Coleman Ladd papers/Archives of American Art/Smithsonian Institution hide caption

itoggle caption American Red Cross/Anna Coleman Ladd papers/Archives of American Art/Smithsonian Institution

Kevin and Joyce Lucey remembered their son, Jeff, in an interview with StoryCorps in Wellesley, Mass. Jeff, a U.S. Marine, took his own life months after returning from a deployment in Iraq. StoryCorps hide caption

itoggle caption StoryCorps

This image, posted on a militant website, shows an Islamic State fighter waving a flag from a captured government fighter jet in Raqqa, Syria. The Islamic State captured the city in northeastern Syria last year and it has effectively served as its capital. Uncredited/AP hide caption

itoggle caption Uncredited/AP

Soldiers fill a hole left by an explosion on a road outside Beiji, Iraq, in 2005. In his debut novel, Michael Pitre follows a group of Marines doing similar work on Iraq's highways. Ryan Lenz/AP hide caption

itoggle caption Ryan Lenz/AP

Vance, who serves as a coach, founded the group after his own struggle with PTSD. He says it helped him get out of a dark place. He now has a degree in social work. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Mark Pierce enlisted in the military in 1970, served in Vietnam and retired in 2010. Years later, his two sons also joined the armed forces. Courtesy of Mark Pierce hide caption

itoggle caption Courtesy of Mark Pierce

Volunteers at the Maryland Food Bank in Baltimore sort and box food donations on a conveyor belt. The bank started working with groups like the USO in 2013 to provide food aid to families affiliated with nearby military bases. Pam Fessler/NPR hide caption

itoggle caption Pam Fessler/NPR