Wounded Soldiers Visit Afghanistan with Operation Proper Exit [Getty Images]

BAGRAM, AFGHANISTAN - MARCH 12: U.S. Army SGT (retired) Daniel Harrison (L) from Atlanta, Texas, and SGT (retired) Noah Galloway from Birmingham, Alabama, return to Bagram Airfield after visiting a forward operating base (FOB) on March 12, 2014 near Bagram, Afghanistan. The two were part of a group of wounded soldiers touring Afghanistan with the Troops First Operation Proper Exit program. The program brings wounded servicemen back to Iraq and Afghanistan to help them come to terms with their injuries. (Photo by Scott Olson/Getty Images)

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