Challenges ahead as millitary prepares to move troops from Iraq to Afghanistan

The World
The U.S. military is preparing for an unprecedented move, working to get thousands of troops into Afghanistan from Iraq. Transporting so many people and billions of dollars worth of equipment poses unique and dangerous logistical challenges for the military. The scale of the operation is vast and private contractors are working alongside troops to meet the August deadline. For details, we turn to Stephen Farrell, who reported the story for The New York Times, and Lt. Col. Jerry O'Hara, a public affairs officer for the U.S. military.