In 1942, the Minneapolis Police Department built and configured the Air Raid Control Center which was subsequently staffed and managed by municipal employees.
This photograph was taken on September 11, 1942.
From left to right we see: O. A. Pearson, Chief of the Air Raid Control Center for Minneapolis, conferring with Spencer Brader, his assistant while Nathan Harris, Panel Clerk, records the location and type of incident reported to the telephone bank operators and Herman Olson, Plotter, charts the incident on a large map of the city.
Photograph courtesy of Hennepin County Library