National Museum of Nuclear Science & History
H. J. Mack worked for the Edenfield Electric Company.
George Royster was a civilian physicist working at the X-10 graphite reactor in Oak Ridge, Tennessee.
Willard Burgess worked for the Roane-Anderson Company.
Joseph (J.) Garrott Allen was a research associate in the Health Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.