Re: What would the US do if....
 

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In a nuclear exchange --- define win?

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Your opponent loses.

Duh.

Re: What would the US do if....
 

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I'm all for trying it out 3 miles over Tehran or Pyongyang to gather empirical data. We could then extrapolate the results to see if an entire continent could be put at risk.

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I think someone already did this to Pyongyang.
http://www.activatechat.net/earthnight.jpg

The difference between N. Korea and S. Korea is amazing.