National Museum of Nuclear Science & History
Helena Calloway was a laboratory assistant in the Chemistry Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Minnesota native Roger Hultgren worked for the DuPont Company as a chemist during the early 1940s, initally assigned to the Jolliet, Illinois munitions plans.
Clinton B. Gass was a G.I. at Los Alamos who worked in the Special Engineer Detachment unit under the Theoretical Physics Division, headed by Dr.
Elsie (Blumer) McMillan lived at Los Alamos during the Manhattan Project. Her husband, Edwin McMillan, was a physicist who worked on implosion at Los Alamos.
