National Museum of Nuclear Science & History
Bradley worked in the United States Engineer District Office.
Walter A. Spradlin served as a staff sergeant in the 393rd Bombardment Squadron. He was the tail gunner regularly assigned to the B-29 Strange Cargo.
Smith worked at the 100-B Area at Hanford during the Manhattan Project.
Sergeant Frank Karcher was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
