National Museum of Nuclear Science & History
Johnson worked at the 300 Area at Hanford during the Manhattan Project.
Marion R. Villarreal served in the 603rd Air Engineering Squadron.
Robert B. Duffield was a Researcher at the Los Alamos National Laboratory from 1943 to 1946. He later worked at the Argonne National Lab.
H. T. Ledford worked for the Tennessee Eastman Corporation at the Y-12 Plant.