National Museum of Nuclear Science & History
O'Brien worked for Stone and Webster Engineering Corporation.
Acie Singleton was a laborator helper at the Metallurgical Laboratory in Chicago during the Manhattan Project.
John W. Burr was a research assistant in the Metallurgical Laboratory (“Met Lab”) at the University of Chicago during the Manhattan Project.
H. H. Brand worked for the Edenfield Electric Company.
Lieutenant Donald Collins was assigned to the University of Chicago's Met Lab in the Health Physics Division.
