National Museum of Nuclear Science & History
Tappscott worked at the 100-F Area at Hanford during the Manhattan Project.
A. O. Seidel worked for the Asbestos & Magnesia Materials Company.
Leroy Jackson was transferred into the Manhattan District, the branch of the United States Army Corps of Engineers tasked with overseeing the construction of critical Manhattan Project sites, shortly after its formation in 1942.
