National Museum of Nuclear Science & History
Ed Helfenberger worked for the Roane-Anderson Company.
Gale Kenney was a member of the Special Engineering Detachment and worked in the K-25 Plant in Oak Ridge, Tennessee.
H. Cohen worked for the Roane-Anderson Company.
Sanford McDonnell was a mechanical engineer with the Special Engineering Detachment at Los Alamos from April 1944 to April 1946.
