On August 30, the first time since 1968, a U.S. bomber transported missiles armed with six nuclear warheads. By accident.

The story is front page CNN.com, but here is the more detailed version at Military Times.

The article quotes Hans Kristensen and Phil Coyle on a very important point. This mixup would not be an easy mistake to make, which means security measures were seriously overlooked.


Hans Kristensen, director of the Nuclear Information Project at the Federation of American Scientists, said a host of security checks and warning signs must have been passed over, or completely ignored, for the warheads to have been unknowingly loaded onto the B-52.

ACMs are specifically designed to carry a W80-1 nuclear warhead with a yield of 5 to 150 kilotons and delivered by B-52 strategic bombers.

“It’s not like they had nuclear ACMs and conventional ACMs right next to each other and they just happened to load one with a nuclear warhead,” Kristensen said.

The Defense Department uses a computerized tracking program to keep tabs on each one of its nuclear warheads, he said. For the six warheads to make it onto the B-52, each one would have had to be signed out of its storage bunker and transported to the bomber. Diligent safety protocols would then have had to been ignored to load the warheads onto the plane, Kristensen said.

All ACMs loaded with a nuclear warhead have distinct red signs distinguishing them from ACMs without a nuclear yield, he said. ACMs with nuclear warheads also weigh significantly more than missiles without them.

“I just can’t imagine how all of this happened,” said Philip Coyle, a senior adviser on nuclear weapons at the Center for Defense Information. “The procedures are so rigid; this is the last thing that’s supposed to happen.”

The warheads could not have been detonated, either on purpose or in the event of an accident. Yet the fact that they were missing for 3 and a half hours -the mistake was only noticed when the plane landed – is very distrubing.

Are accidents with nuclear weapons rare? Is 10 rare? 20?

Here are the well known mishaps, involving test launches, mistaken simulations, and even a bear. There are more details and analysis in Scott Sagan’s The Limits of Safety.