National Museum of Nuclear Science & History
H. S. Russell worked for the Roane-Anderson Company.
Homer M. O’Callaghan served in the 1st Ordnance Squadron.
H. A. Rehnberg worked for the Kellex Corporation at the K-25 Plant.
Mary E. Parrish was a research assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
