Members of the 182nd Infantry Regiment arrive in Indiana after spending a year in Afghanistan. They will spend about a week here before returning to their homes in New England. Tom Dreisbach/NPR hide caption

itoggle caption Tom Dreisbach/NPR

Gen. Peter Chiarelli, former vice chief of staff for the U.S. Army, says the Army lacks reliable diagnostic tools to screen for mental health. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

U.S. Brig. Gen. Kevin Bergner speaks in Baghdad in July 2007 near a poster of Ali Musa Daqduq. Daqduq was captured in Iraq in March 2007, and is accused of orchestrating the killings of five U.S. soldiers. The U.S. left Daqduq in Iraqi custody when U.S. troops formally withdrew in December. But the Obama administration is seeking to try him before a military commission. Wsthiq Khuzaie/AP hide caption

itoggle caption Wsthiq Khuzaie/AP

Hell and Back Again focuses on Sgt. Nathan Harris' life on the battlefield in Afghanistan and at home in North Carolina. Courtesy Danfung Dennis hide caption

itoggle caption Courtesy Danfung Dennis

Traumatic brain injuries are most often caused by powerful blasts from improvised explosive devices. A roadside bomb explodes, and the concussive effect violently shakes the brain inside the skull. Stefano Rellandini/Reuters /Landov hide caption

itoggle caption Stefano Rellandini/Reuters /Landov

After a 20-year absence, Aseel Albanna returned to her native Iraq and found a very different country. Here, she poses with the statue of King Shahryar, a character in The Thousand and One Nights, near the Tigris River in Baghdad. Sean Carberry/NPR hide caption

itoggle caption Sean Carberry/NPR