National Museum of Nuclear Science & History
Ed Helfenberger worked for the Roane-Anderson Company.
C. H. Pearson worked for the Kellex Corporation at the K-25 Plant.
John C. Hansen served as a Master Sergeant in the 393rd Bombardment Squadron. He was a member of the ground crew regularly assigned to the B-29 Laggin’ Dragon.
D.C. Stewart was a Staff Sergeant in the Special Engineer Detachment at the Metallurgical Laboratory in Chicago during the Manhattan Project.
