National Museum of Nuclear Science & History
Litchfield worked in the 100 F Area at Hanford during the Manhattan Project.
C. C. Mullins worked for the Fercleve Corporation.
Andrew Welch was a janitor at the Chicago Met Lab during the Manhattan Project.
Ralph B. Larsen was a machinist at Los Alamos during the Manhattan Project. His wife, Ruth Anderson, also worked at Los Alamos.
Juan Romero was a staff worker at Los Alamos during the Manhattan Project.