take nathan scheller. he was a tank commander, he suffered multiple concussions in iraq. he says, at first, he felt he didn't deserve a purple heart- some of his buddies lost their legs. but now that he's home, scheller realizes his brain doesn't work right anymore, and his wife miriam agrees. >> it's a lot more to even try to get his attention. he repea himself a lot more now that he's been home. in the five minutes he's telling a simple story, he'll tell that story five times. you can't see his injury. so there's even times when i as a spouse forget something's really going on with him. >> scheller was home from iraq for a year before doctors diagnosed his traumatic brain injury. they sent him to a brain rehabilitation clinic. but when it comes to the purple heart, he has to prove that he was wounded in a specific explosion on a specific day. he has to show that a doctor diagnosed his t.b.i., and treated him. that's a huge problem, because army doctors didn't keep many of those records on the battlefield. >> i would get told that i need this form, so i would get this fo