Exposed to airborne hazards, veterans struggle to breathe

Among the more than 2.5 million men and women who have served in the wars in Iraq and Afghanistan, there are many veterans -- exposed to sandstorms, burn pits and other hazards -- who suffer from a mysterious pulmonary illness, as well as the confusion and doubt that surrounds their condition. The NewsHour's Dan Sagalyn reports, with narration from Nick Schifrin.