>> congressman charlie rangel, thank you for your time today. >> thank you for having me. back at the washington nafty yard, the inspiration reopened except for the building where the shootings took place and we now know more about the gun aaron alexis used in the rampage. authorities say he scratched two phrases into the shotgun. one said, quote, better off this way. the other etching, my elf weapon. officials don't know what either of those two mean. also to the investigation after complaining to the police in rhode island that he was hearing voices, alexis went for treatment at a va hospital, but only said he was having trouble sleeping. nothing about hearing voices. nbc news national investigative correspondent michael isikoff is joining us now. michael, you have a new, exclusive report about the doj probe into the contractors who the government use to vet people for security clearances there. tell us about that. >> exactly. in addition to the defense department review announced by secretary hagel, the just is