Defense Secretary Leon Panetta arrived in Afghanistan, pledging that the U.S. would not change its strategy, despite recent tensions. In a possible acknowledgment of tensions after a U.S. soldier allegedly massacred 16 Afghan civilians, Marines were asked to leave their weapons outside the tent before Panetta spoke. An Afghan official says there is security footage of the soldier returning to his base and raising his arms in surrender. A delegation investigating the shooting was hit with a bomb that killed one intelligence official. Yesterday a delegation visiting the site was attacked by gunmen.