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US Vice President Joe Biden (L) meets with General Lloyd Austin, the commander of United States Forces - Iraq (USF-I), and US ambassador in Iraq James Jeffrey (unseen) at the US embassy upon the former's arrival at Baghdad on a surprise visit on November 29, 2011, during which he is due to meet top Iraqi officials, as American troops depart Iraq ahead of a year-end deadline. AFP PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
US Vice President Joe Biden (L) meets with General Lloyd Austin, the commander of United States Forces - Iraq (USF-I), and US ambassador in Iraq James Jeffrey (unseen) at the US embassy upon the former's arrival at Baghdad on a surprise visit on November 29, 2011, during which he is due to meet top Iraqi officials, as American troops depart Iraq ahead of a year-end deadline. AFP PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

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U.S. and Iraqi troops honored

Vice President Joe Biden paid tribute to the sacrifices of U.S. and Iraqi troops at a ceremony for troops.

U.S. and Iraqi troops honored

Vice President Joe Biden paid tribute to the sacrifices of U.S. and Iraqi troops at a ceremony for troops.