Fox News Flash top headlines are here. Check out what's clicking on Foxnews.com. The much-anticipated, high-tech B-21 bomber will "come on in two years," bringing new dimensions of stealth, software, attack possibilities and nuclear deterrence to the U.S. Air Force. It would even possibly usher in new tactical approaches to how modern operations may move forward in the years ahead. In a conversation with the Mitchell Institute for Aerospace Studies regarding the importance of modernizing the nuclear triad, Air Force Chief of Staff General Stephen Wilson confirmed that the stealthy new aircraft will "come on in two years."