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Look up at any presidential event and you’re likely to see them: men dressed in black, armed to the teeth, looking back.

It’s no secret; they’re with the Secret Service.

On Tuesday at the inauguration, members of the U.S. Secret Service’s elite countersniper unit will be out in force, taking roof-top positions along Pennsylvania Avenue and elsewhere as the presidential motorcade glides past throngs of people for the swearing in of Barack Obama

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Embedded video from <a href="https://www.cnn.com/video">CNN Video</a> Look up at any presidential event and you're likely…