Watch part two
As a candidate for the US presidency, Barack Obama staked much of his his campaign on the claim that the war in Iraq was a distraction from the "good war" against the Taliban in Afghanistan.
Local and regional support is waning, and US hopes for an exit strategy seem increasingly out of reach.
On the latest Fault Lines, Josh Rushing embeds with US troops on the front lines of Obama's war and examines if an Iraq-style "surge" could work in Afghanistan.