US President Barack Obama addresses troops at Fort Campbell, Kentucky, May 6, 2011 after he met and decorated the “full assault force” behind the clandestine raid that killed Osama bin Laden, a White House official said. Obama and Vice President Joe Biden held a series of closed door meetings with special operations troops, then decorated the entire force handing out Presidential Unit Citations, the highest unit award he has the power to grant. AFP PHOTO/Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)