National Museum of Nuclear Science & History
Pfennig worked for Stone and Webster Engineering Corporation.
Patricia Hansard worked as a “cubicle girl” in the Y-12 Plant from 1943 until the end of the war.
Hugo Leckelt was a laborer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
John A. Russo served in the First Ordnance Squadron.
