Two years after National Guardsmen Spc. Patrick McCaffrey and 1st Lt. Andre Tyson were killed in Iraq, the truth about their deaths has been exposed. Military officials initially told the families that the two men had been killed in an ambush by insurgents but an Army investigation concluded that they were in fact murdered by members of the allied Iraqi Civil Defense Corps. The military only told the families the truth this week. We speak with Nadia McCaffrey–the mother of Spc. Patrick McCaffrey–who is accusing the Pentagon of a deliberate cover-up. [includes rush transcript]