ADVANCE FOR PUBLICATION ON SATURDAY, SEPT. 4, AND THEREAFTER - Retired NYPD Officer Ken Winkler, sits in his office on Tuesday, Aug. 3, 2021, in New York. Winkler helped coordinate the New York Police Department Emergency Service Unit response on-scene at the World Trade Center on Sept. 11, ducking behind a truck to escape the debris when the south tower collapsed. "It went from a clear day to various shades of gray and black … from kind of organized chaos to just chaos," recalls Winkler. (AP Photo/Wong Maye-E)