Nick Staback, who lost both of his legs to a bomb in Afghanistan, talks with his mother, Maria Staback, in Scranton, Pa. Maria Staback took a leave of absence from her job to move in with her son while he was recuperating at Walter Reed National Military Medical Center outside Washington, D.C. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

A scene from the early days of the fighting in Iraq in the spring of 2003. In one incident, three members of an Iraqi family were killed. A U.S. Marine involved in the shooting recently tracked down the family to ask for forgiveness. Laurent Rebours/AP hide caption

itoggle caption Laurent Rebours/AP

John Walker Lindh was captured in Afghanistan in 2002 after fighting with the Taliban. File Photo/AP hide caption

itoggle caption File Photo/AP

Tilman, Arlington National Cemetery, Arlington, Virginia, 2012 Charlotte Dumas/Courtesy of the Corcoran Gallery of Art hide caption

itoggle caption Charlotte Dumas/Courtesy of the Corcoran Gallery of Art

Brian Castner served as an Explosive Ordnance Disposal officer in the U.S. Air Force from 1999 to 2007, deploying to Iraq to command bomb disposal units in Balad and Kirkuk in 2005 and 2006. Joey Campagna/Courtesy of the author hide caption

itoggle caption Joey Campagna/Courtesy of the author

Capt. Jared Larpenteur plans a combat mission at the 82nd Airborne's Delta Company command center in Ghazni province, Afghanistan, earlier this year. Amy Walters/NPR hide caption

itoggle caption Amy Walters/NPR

Jake Dobberke, 26, a Marine who lost his legs in Afghanistan, watches for turkeys in Potter County, Pa. The LEEK Hunting and Mountain Preserve helps healing young vets explore the wilderness in adaptive hunting gear. Jenelle Pifer/WESA hide caption

itoggle caption Jenelle Pifer/WESA