National Museum of Nuclear Science & History
Clarence Signaigo was a laboratory helper at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Daniel J. Keefe was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Clifford E. Willison served in the 1027th Air Material Squadron.
Bernard Rosenman served in the Special Engineer Detatchment (SED) at Los Alamos during the Manhattan Project