An Afghan national army soldier fires a rocket-propelled grenade as Afghan and US soldiers engage in a fire-fight with Taliban forces on July 18. The photo was taken the same day that General David Petraeus handed over command of forces in the region to General John Allen. Petraeus will become the new director of the CIA. As the US starts to withdraw almost one-third of its some 100,000 troops from Afghanistan after a war lasting a decade, a greater amount of reponsibility is being transferred to Afghan forces.