National Museum of Nuclear Science & History
MacDonald was a member of the Instrument Section at the University of Chicago’s Metallurgical Laboratory.
A. R. McCallum worked for the United States Engineer District Office.
Thomas S. Grennan served as a 2nd lieutenant in the 393rd Bombardment Squadron.
Cash worked as an operator at the Y-12 plant at Oak Ridge during the Manhattan Project.
John C. Hofstede served in the 393rd Bombardment Squadron.