National Museum of Nuclear Science & History
F. Snodgrass worked for the Roane-Anderson Company.
B. W. Bonini worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Arthur L. Hughes was an British/Welsh physicist. He worked on the Manhattan Project in St. Louis on the cyclotron and plutonium production and at Los Alamos, NM.
Melvin A. Miller was a draftsman at the University of Chicago Met Lab. In 1946, he sketched two famous drawings of Chicago Pile-1 based on the descriptions of scientists who were present when it went critical.
Heffner worked at the 200 East Area at Hanford during the Manhattan Project.