National Museum of Nuclear Science & History
J. B. Allen worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Sanford McDonnell was a mechanical engineer with the Special Engineering Detachment at Los Alamos from April 1944 to April 1946.
H. L. Longcrier worked for the J.A. Jones Construction Company.
Jack Hefner joined the Manhattan Project at Oak Ridge in 1943. Hefner was a reactor engineer and helped supervise the construction of the X-10 Graphite Reactor.
