National Museum of Nuclear Science & History
Hartman worked for Stone and Webster Engineering Corporation.
John Smith was a guard at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Robert E. Keister served in the 393rd Bombardment Squadron.
Velva Irwin worked as a Calutron girl at the Y-12 Plant at Oak Ridge, TN. She was only 16 when she began working on the Manhattan Project.
