As a group of residents cheered, a Glen Park man tackled Gary Patrolman Carl Cochran, choking the officer and threatening to kill him in an unprovoked attack Wednesday night, Lt. Roger Smith said. Cochran, a five-year veteran and member of the department’s elite S.W.A.T. team, suffered cuts to his face and injuries to his arm and back as a result of the protracted struggle with Kelvin D. Banks, 40. Cmdr. Jerome Krebes said Thursday he ordered additional patrols in the area in response to the incident. A small group of people — ten or less — surrounded the officer during...