Bill Evanina is the national counterintelligence executive and director of the National Counterintelligence and Security Center. In an exclusive interview, he speaks candidly about the damage that Edward Snowden's leaks continue to cause. From terrorists to hostile nation-states to hackers, Snowden's guidance has shown them how to avoid being detected by the U.S. intelligence community. This week's episode of Target USA examines why that's a serious threat to the nation and you.