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.
Alfred Zuk was a member of the Special Engineer Detachment assigned to the 509th Composite Group in Wendover, Utah from 1944 to 1945.
G. W. Flack worked for the Union Carbide & Carbon Corporation.
