Watch part twoOne of Barack Obama's biggest foreign policy challenges since he became president in January 2009 has been Afghanistan. He calls it a war of necessity and has ordered the deployment of another 30,000 troops there. Obama says the US military escalation is intended to deny al-Qaeda a safe haven and to reverse the Taliban's momentum. As the conflict enters its ninth year, we look back at the initial weeks of the war through the perspective of a US military officer who led the first special forces team deep inside Taliban territory in 2001.
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