National Museum of Nuclear Science & History
Lloyd worked in the 100 F Area at Hanford 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.
Carr worked at the 200 West Area at Hanford during the Manhattan Project.
Hartman worked for Stone and Webster Engineering Corporation.
