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(L to R) Ibtihaj Muhammad, Dagmara Wozniak and Mariel Zagunis of the USA celebrate their gold medal in team sabre during the Guadalajara 2011 Pan American Games, in Guadalajara, Mexico, on October 28, 2011.AFP PHOTO/OMAR TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

U.S. flag-bearer Mariel Zagunis

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