National Museum of Nuclear Science & History
O'Brien worked for Stone and Webster Engineering Corporation.
Sanford McDonnell was a mechanical engineer with the Special Engineering Detachment at Los Alamos from April 1944 to April 1946.
John C. Lydon, Jr. served in the 603rd Air Engineering Squadron.
Rupp worked at the 300 Area and the 200 West Area at Hanford during the Manhattan Project.
