If the U.S. takes military action in Syria, it would cost as much as $1 billion a month, says Joint Chiefs Chairman Gen. Martin Dempsey, and if the Syrian government is overturned before a replacement is ready, extremists could move in and chemical weapons could be used. Dempsey delivered his assessment to the Senate Armed Services Committee, outlining the costs, benefits and risks of U.S. options that range from establishing a no-fly zone to training the Syrian opposition.

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