NEW : ` ` I do n't think we can finally defeat al Qaeda '' without getting bin Laden , McChrystal says . The general said the U.S. military was still working to determine whether it had killed or captured any of Bin Laden's top lieutenants and that he did not know if they were in Pakistan. General , U.S. ambassador testify before House and Senate armed services committees . McChrystal : Perceptions of Afghan people and insurgency will be critical to success . In addition , he said , pushing back the Taliban -- which allowed al Qaeda to operate from Afghanistan before 9/11 -- is a `` prerequisite '' for destroying the terrorist network . McChrystal : `` I do n't view July 2011 as a deadline . ''
NEW : ` ` I do n't think we can finally defeat al Qaeda '' without getting bin Laden , McChrystal says . The general said the U.S. military was still working to determine whether it had killed or captured any of Bin Laden's top lieutenants and that he did not know if they were in Pakistan. General , U.S. ambassador testify before House and Senate armed services committees . McChrystal : Perceptions of Afghan people and insurgency will be critical to success . McChrystal : `` I do n't view July 2011 as a deadline . ''