Obama's 100 days - the Afghan challenge

April 29, 2009 - Thousands of US marines are heading to Afghanistan as part of Obama's strategy to combat Taliban forces and improve security in the country, but some wonder if Obama's troop plan will make a difference.Al Jazeera's Rosiland Jordan travelled to the US marine base at Camp Lejeune in North Carolina to see how US forces there are preparing for deployment and to assess the challenges they - and Obama - face.