Blast Injury: The Invisible Wound

"I was in denial a lot that I was even injured. And I was in denial that I rated Purple Heart for a while. Which was difficult for me because I had a lot of friends that had been more severely wounded, physically, than I had."

The story of Gunnery Sgt. Evan Ahlin, a blast-induced TBI survivor who continues to serve, more than seven years after his initial injury.