ARLINGTON, VA - MAY 18: U.S. Secretary of Defense Robert Gates (L) and Chairman of the Joint Chiefs of Staff Admiral Mike Mullen (R) conduct a news briefing May 18, 2011 at the Pentagon in Arlington,... more 
ARLINGTON, VA - MAY 18: U.S. Secretary of Defense Robert Gates (L) and Chairman of the Joint Chiefs of Staff Admiral Mike Mullen (R) conduct a news briefing May 18, 2011 at the Pentagon in Arlington, Virginia. Gates and Mullen said there was no evidence showing top Pakistani officials knew the where about of Osama Bin Laden before the U.S. SEAL team killed the al-Qaeda leader. (Photo by Alex Wong/Getty Images) less 
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Getty Images | Photo By Alex Wong / Getty Images
Wed, May 18, 2011 2:27 PM EDT