National Museum of Nuclear Science & History
Harry Reason was a janitor at the Metallurgical Laboratory in Chicago during the Manhattan Project.
William Rose worked as a welder at the Allis-Chalmers Manufacturing Company in West Allis, Wisconsin from November 1943 to April 1946.
Dana Mitchell was an American physicist. He was in charge of procurement for the physics department at Columbia University during the first year of the Manhattan Project.
Richard Recker served in the Special Engineer Detatchment (SED) at Los Alamos during the Manhattan Project.