Street gangs had become so intimidating in Springfield that citizens stopped calling the police on them. And no wonder: gangs were so strong that motorcycle-riding members once cruised a neighborhood with military-style assault rifles strapped to their backs in a show of force. But crime in the gang-infested areas of the Massachusetts city has begun to drop after law enforcement started using a military-style approach of its own. As Lesley Stahl reports, counterinsurgency methods used in overseas conflicts are being employed in Springfield to take the streets back from the gangs. Stahl's report will be broadcast on 60 Minutes, Sunday,...