National Museum of Nuclear Science & History
Butt worked in the United States Engineer District Office.
William E. Caldes studied chemical engineering at Princeton University. In 1943, he was recruited to join the Manhattan Project, and became the 19th project member at Los Alamos.
A. L. Barber worked for the H. K. Ferguson Company.
Robert R. Williamson was a laboratory assistant and computer at the University of Chicago’s Metallurgical Lab (“Met Lab”) during the Manhattan Project.
