National Museum of Nuclear Science & History
Winfield Sylvester was a staff worker at Los Alamos during the Manhattan Project.
J. A. Marshall worked for the Union Carbide & Carbon Corporation.
Hallie Perry was an electrician at Oak Ridge, Tennessee for the Watson-Flagg Engineering Company from 1943 to 1945.
Lewin worked in the 100 D Area at Hanford during the Manhattan Project.