First responders from all over the country have come together in Mercury, Nevada to train for a potential radiological attack on U.S. soil.
About NBC News Specials
NBC News brings its worldwide resources to these in-depth special programs. Brian Williams takes the lead in covering topics that enlighten, uplift or demand further scrutiny. Important stories of our time; these are the stories of NBC News Specials. See More
Check out more stuff on Yahoo View