Ok. Do not really want to harp on this too much. But this animation pretty much sums it up.
Recent reports suggest that the Bush administration is considering using nuclear weapons against Iran. The very fact that nuclear weapon use is being discussed as an option—against a state that does not have nuclear weapons and does not represent a direct or imminent threat to the United States—illustrates the extent to which the Bush administration has changed U.S. nuclear weapons policy.
The last time a nuclear weapon was used against another nation was… well heck. You know the answer. It was the U.S. against Japan – and some analysts point out that the war was pretty much won by the U.S. – you know, it just seemed like a good idea at the time to let this thing off over a civilian target just to see what would happen.
Anyway – the past is gone. Back in 2007 for a moment.
Check out this marvelous animation on the folly of bunker busting technology.