National Museum of Nuclear Science & History
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.
Sidney Major, Jr. worked for the United States Engineer District Office.
E. M. Pownall worked for the Edenfield Electric Company.
Jose Ortiz was a staff worker at Los Alamos during the Manhattan Project.
