A volunteer disaster response organization credited with rescuing thousands of people during Hurricane Katrina and other crises wants to help in the search for Nancy Guthrie. But embattled Pima County Sheriff Chris Nanos has, so far, brushed them off - and members of the group want to know why, Wonderwall.com can report. Today show host Savannah Guthrie's 84-year-old mother has been missing since early February, and hope of finding her is fading with each passing day. That's why the members of the United Cajun Navy are so frustrated.