National Museum of Nuclear Science & History
William Gray worked for the Roane-Anderson Company.
Mars worked for Stone and Webster Engineering Corporation.
H. R. Kroegar worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Elvin Olsen was a staff worker at Los Alamos during the Manhattan Project.
Parr worked in the 200 East and 100 D Areas at Hanford during the Manhattan Project.
