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

The Natanz facility, shown here in a photo taken May 14, 2009, is about 150 miles from Tehran. AP/GeoEye Satellite Image/AP/GeoEye Satellite Image hide caption

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Iraqi Prime Minister Nouri al-Maliki (center) arrives on May 8 at Kirkuk airport in northern Iraq, on his first visit to the multi-ethnic city since taking office. Marwan Ibrahim/AFP/Getty Images hide caption

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A veteran of the Iraq War with post-traumatic stress disorder talks to physical therapist Nicole Bormann before a session in the VA Medical Center in St. Louis. Chris Hondros/Getty Images hide caption

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Brothers Deven (left) and Erik Schei ride by President Barack Obama on the South Lawn of the White House as part of the sixth annual Wounded Warrior Project's Soldier Ride on Friday. Saul Loeb/AFP/Getty Images hide caption

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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