forgotten. so he signed the clay hunt suicide prevention act named for a young marine who survived the war in afghanistan but ultimately lost the battle against his post-war demons. here now is bob woodruff. >> reporter: he was a strong marine, corporal clay hunt, visibly wounded by a bullet piercing his wrist, but invisibly tormented by post-traumatic stress. so severe that at age 28 he killed himself, two years after returning from afghanistan. he was treated for depression by the v.a., mostly with drugs. when they didn't work, he just got more. he told his friends he felt like a guinea pig for drugs. he tried to warn others in this video on mtv. >> i have done and seen things in my life that for one most people should never have to see. >> reporter: approximate post-traumatic stress he couldn't keep can his job. football games and fireworks set off panic attacks. he wanted to do something. so he traveled with an organization started by a fellow marine to help victims of the