National Museum of Nuclear Science & History
Edna Sypult was a laboratory helper at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Cordell W. Callahan served in the 1st Ordnance Squadron.
John M. Sprecher was a chemical engineer. During the Manhattan Project, he worked for DuPont in Wilmington, DE.
Neil Bergen was a security guard at the Metallurgical Laboratory in Chicago during the Manhattan Project.
