National Museum of Nuclear Science & History
William Rose worked as a welder at the Allis-Chalmers Manufacturing Company in West Allis, Wisconsin from November 1943 to April 1946.
Clarence Signaigo was a laboratory helper at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Cole worked for Stone and Webster Engineering Corporation.
A. R. McCallum worked for the United States Engineer District Office.
