U.S. flag-bearer Mariel Zagunis

Associated Press
From left: Mariel Zagunis, Ibtihaj Muhammad, Dagmara Wozniak and Daria Schneider, of the United States, celebrate on the podium after winning a bronze medal in a women's team sabre final match at the World Fencing Championship in Catania, Italy, Saturday, Oct. 15, 2011. (AP Photo/Antonio Calanni)

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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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