The Mall of America in Bloomington, Minn., has implemented a security program aimed at aiding the government identify suspected terrorists. Jim Mone/AP hide caption

itoggle caption Jim Mone/AP

The Mall of America, one of the nation's largest shopping and entertainment venues, is also home to its own counterterrorism unit. Dawn Villela/AP hide caption

itoggle caption Dawn Villela/AP

Sgt. Nathan Scheller was twice denied for a Purple Heart, though roadside bomb explosions left him with lasting cognitive damage. Above, Scheller walks with his wife, Miriam, and his family. NPR/Frontline hide caption

itoggle caption NPR/Frontline

Food writer Nancy Harmon Jenkins and her daughter Sara, together in Spain in 1966. Sara, like her mom, is now also a cookbook writer. Courtesy of Nancy Jenkins/ hide caption

itoggle caption Courtesy of Nancy Jenkins/