National Museum of Nuclear Science & History
C. L. McCallum worked for the Tennessee Eastman Corporation at the Y-12 Plant.
R. O. worked for Clinton Laboratories at the X-10 Reactor.
Patricia “Pat” Postma came to Oak Ridge, Tennessee as a kindergartner after her father, Thomas Dunigan, was recruited from the Army Signal Corps to join the Manhattan Project.
John Arnold joined the Manhattan Project in 1943 when the MED tasked his employer, the Kellogg Corporation, with developing a special barrier for the gaseous diffusion plant in Oak Ridge.
