National Museum of Nuclear Science & History
Robert Ball was a security guard at the Metallurgical Laboratory in Chicago during the Manhattan Project.
G. O. Robinson, Jr. worked for the United States Engineer District Office.
Paul Tinsley worked for the H. K. Ferguson Company.
H. L. Ray worked for the Kellex Corporation at the K-25 Plant.
E. H. Gray worked for the Tennessee Eastman Corporation at the Y-12 Plant.