National Museum of Nuclear Science & History
W. S. Porter worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Daniel J. Keefe was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Born in 1903 in Baltimore, Mackie studied civil engineering at Union College in Schenectady, New York.
Halloran worked in the United States Engineer District Office.
