Al-Qaida is known to keep meticulous records. Experts say that's the influence of Osama bin Laden, shown in 1998, who was obsessed with documenting everything. Rahimullah Yousafzai/AP hide caption

itoggle caption Rahimullah Yousafzai/AP

Secretary of State Hillary Rodham Clinton and Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, were in Islamabad today (May 27, 2011). Aamir Qureshi /AFP/Getty Images hide caption

itoggle caption Aamir Qureshi /AFP/Getty Images

Pakistani military and police officials cordoned off a street in Abbottabad near the compound where Osama Bin Laden was found and killed. (May 8, 2011, file photo.) Asif Hassan /AFP/Getty Images hide caption

itoggle caption Asif Hassan /AFP/Getty Images

U.S. Sen. John Kerry (left) shakes hands with Pakistani Prime Minister Yousuf Raza Gilani during a meeting in Islamabad on Monday. Aamir Qureshi/AFP/Getty Images hide caption

itoggle caption Aamir Qureshi/AFP/Getty Images

A still image from video footage released by the U.S. Department of Defense shows Osama bin Laden watching himself on TV. Rex Features/AP hide caption

itoggle caption Rex Features/AP

Corporal Daniel Wheeler, Bravo Co. 1/5 Marines, walks through a waist high wheat field on a patrol in Sangin District near the Helmand River in southern Afghanistan earlier this month. David Gilkey /NPR hide caption

itoggle caption David Gilkey /NPR