Walter Lones

F. J. Ward

F. J. Ward worked for the J.A. Jones Construction Company.

D. N. Hume

William F. Lightfoot

William F. Lightfoot worked on the fuse of the “Fat Man” implosion bomb as manufacturing and test equipment manager for the Raytheon Company.

John Mihalkanin

John Mihalkanin was a laboratory helper at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.