U.S. President Barack Obama is greeted by Vice President Joe Biden as he arrives to speak to troops at Fort Campbell in Kentucky May 6, 2011. Obama is scheduled to speak to several military units that have recently returned from duty in Afghanistan. Also during his visit, Obama privately thanked some members of the elite special forces team involved in the raid that killed Osama bin Laden.

REUTERS/Kevin Lamarque (UNITED STATES – Tags: MILITARY POLITICS)