National Museum of Nuclear Science & History
Philip C. McKenna was a laboratory assistant the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Joseph H. Heartberg was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
R. W. Llewellyn worked for the United States Engineer District Office.
A. P. Kelly worked for the Tennessee Eastman Corporation at the Y-12 Plant.
