National Museum of Nuclear Science & History
Charles Youmans worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Seymour Calvert served for 11 months in the Special Engineering Detachment at Los Alamos. He specialized as a chemical engineer, and carried out experiments with beryllium that were often dangerous.
Harris Harold Levee served in the Special Engineering Detachment at the Metallurgical Laboratory at the University of Chicago on the Manhattan Project.
