National Museum of Nuclear Science & History
Kenneth Peterson was a cryptographer for the 390th Air Service Group in the 509th Composite Group from September 1944 to November 1945.
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.
Harold Hasenfus was part of the Special Engineer Detachment during the Manhattan Project and worked at the University of Chicago's Metalurgical Laboratory and at the gaseous diffusion plant in Oak Ridge.
