On August 30th 2007 a so-called “B-52” long range bomber was flying from North Dakota to Lousiana.
The problem: 3 atomic warheads on board.
At “Minot” (Air force base – ND) they should have been dismantled.
As a consequence, the commander was fired.
Both, President Bush and defense secretary Gates have been informed by the military.
Air force speaker Edward Thomas said, that it is very important to endeavour that the ammunition was safe all the time and under control by the military. Source
I think this is a very serious problem.
More information about U.S. atomic weapons and it’s history:
More information about Chernobyl, atomic power, radiation and Belarus: