U.S. flag-bearer Mariel Zagunis

Mariel Zagunis of the United States reacts on April 13, 2012 during the women's team sabre competition at the 2012 World Fencing Championships in Kiev.  AFP PHOTO / SERGEI SUPINSKY (Photo credit should read SERGEI SUPINSKY/AFP/Getty Images)

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Two-time fencing gold medalist Mariel Zagunis has been chosen as the flag-bearer for the United States in Friday's Opening Ceremony.

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