National Museum of Nuclear Science & History
Clarke worked in the United States Engineer District Office.
Mattie was a staff member at Los Alamos during the Manhattan Project.
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.
Earl W. Fisher served in the 603rd Air Engineering Squadron.
