The US stopped flying bombers armed with nuclear weapons back in 1968, after crashes in Greenland and Spain that contaminated the ground with Plutonium. But last month, a B-52 flew from North Dakota to Louisiana armed with six cruise missiles--each 10 times as powerful as the bomb that destroyed Hiroshima. Tomorrow 100,000 airmen at all Air Combat Command bases will stand down as investigators try to figure out how that happened. Meantime, Russia has tested what it calls the "Father of All Bombs" and resumed Cold-War type bomber patrols close to NATO airspace. What's behind Russia's aggressive behavior? Can the US keep track of its weapons of mass destruction?