Pentagon appointed former CIA director Leon Panetta as Secretary of Defence while Patraeus was appointed as new CIA honcho.
Gen David handed over responsibility for the military campaign to his successor, Lt Gen John Allen in a ceremony ISAF Change of Command ceremony. He thanked Adm Mike Mullen, Gen Langheld& Mattis for leadership and support of troops.
Security experts sees Petraeus appointment as CIA head a crucial twist in Afghan war especially in the backdrop of US May 2 raid in Pakistan that led to killing Osama bin Laden.
The experts say the unmanned drone campaign in Pakistan may get new momentum after Petraeus takes charge of the CIA.