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What is DoD using their supercomputers for?

I always wondered, what is DoD doing with its supercomputers? What kind of problems are they solving that require so much processing power? Probably modeling of some sort, but what are they modeling?
( 2 comments | on HN )
Re:What is DoD using their supercomputers for? by Paul_Morgan on Thursday June 25, 2009 @05:01PM (#674370)
Nuclear Explosion Simulations. If you have a nuclear weapon sitting in storage for thirty to sixty years will it still explode? Can't do real tests anymore by trying one out in Nevada.
Re:What is DoD using their supercomputers for? by ideamonk on Thursday June 25, 2009 @05:42AM (#673403)
Cracking RSA maybe....