Sgt. Ivan Gunter leads a special team of police officers called the Foxtrots in the Southwest Patrol Division of the Dallas Police Department. (Cooper Neill for The Washington Post)
DALLAS — Sgt. Ivan Gunter climbed the stairs, sweating beneath a ceramic-plated tactical vest, his finger resting beside the trigger of his 9mm handgun. He could hear the suspect’s muffled voice above, between thunderous cracks of gunfire.