National Museum of Nuclear Science & History
M. M. MacDonald worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Clarence Signaigo was a laboratory helper at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Haught worked at the 200 West Area at Hanford during the Manhattan Project.
Marshall Holloway was an American physicist. He received his PhD in physics from Cornell University. In 1942, he directed a secret Manhattan Project assignment at Purdue University.
