Marines drop ordnance as part of a live-fire exercise.
Air Force Tests B61-12 Guided Nuclear Bomb
The United States has taken a significant step closer to developing a nuclear bomb that some say could be the most dangerous ever produced. The Department of Energy's National Nuclear Security Administration announced earlier this month that it has completed the development and testing phase of the B61-12, the first-ever guided nuclear bomb. By 2020, the US will commence full-scale production.