"Burn pits" may have put veterans at risk
Over 1.5 million American troops were deployed to Iraq and Afghanistan between 2001 and 2011. Many returned with visible scars of war -- but for some, their injury is hidden. At some of the military bases throughout those regions, waste materials were disposed of in giant so-called "burn pits," and breathing fumes from those fires appears to have damaged the health of countless veterans. Barry Petersen reports.