National Museum of Nuclear Science & History
Bradley Jr. worked at the 200 West Area at Hanford during the Manhattan Project.
Clarence Signaigo was a laboratory helper at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Curt J. Havekotte served in the 1st Ordnance Squadron.
John M. Sprecher was a chemical engineer. During the Manhattan Project, he worked for DuPont in Wilmington, DE.