. >> reporter: frakt said that discovery changed darrell vandeveld forever.n't ignore the violations of law he discovered, critical evidence that was missing, lost, or withheld. >> the rules are applicable to everyone. there is no exception. there are no different forms of justice. >> reporter: that led vandeveld to make the most agonizing decision of his life. in september of 2008, he resigned from the military commission. your conscience is clear? >> my conscience is not clear. i prosecuted mohammed jawad for too long. i participated in the commissions for too long. >> reporter: the pentagon in a statement to cbs news said "vandeveld's statements are proven to be unsubstantiated." >> the pentagon propaganda machine is hard at work to try to discredit darrell vandeveld. >> reporter: he received a poor evaluation report, which essentially ends his military career. >> you do the right thing, you will be forever grateful you did it no matter what happens to you. >> reporter: darrell's biggest regret, mohammed jawad is still behind bars, awaiting trial in guanta