peter chiarelli last year he was in uniform and pushing the cause of america's warriors who suffer brainnjuries. >> these hidden injuries of war, post-traumatic stress and traumatic brain injury, have been with us forever. >> a year later chiarelli has left the service but not the cause. >> i don't want this generation to follow in these same footsteps. these aren't new problems. these are diseases that have been with us forever. >> a severe brain trauma can be a gateway injury leading to depression, anxiety, drug use, or in some cases suicide. early detection may help those most in need. >> we believe we're close to having a bio marker that's going to allow us to go up with a small assay machine and you're going to be able to take a quick blood sample and tell if somebody has had a concussion. >> a year later. >> i think we're a year closer to that. >> of all the figures we can tell you, this one stopped us in our tracks. the va estimates 1 veterans commit suicide every day, that is more than 6,500 a year. put differently. more veterans die of suicide in a year than the enemy has killed