Reply #4: A couple of years ago, Scientific American had an article about them. [View All]

[Silverhair]

Basically, the article showed that they would not be that effective at the lower yields, and at the higher yeilds they would no longer be considered "tactical". The politcal price to be paid for being the first to actually use nukes (Not counting WWII) would be so extremely high that the short term gain just would not be worth it.

Conventional devices can do just a good a job, only you need a few more of them.