Melvin G. Hopkins

Fredrick “Fred” D. Johnson

Fredrick “Fred” D. Johnson was a research assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

H. L. Longcrier

H. L. Longcrier worked for the J.A. Jones Construction Company.

Frank M. Knight

G. W. Flack

G. W. Flack worked for the Union Carbide & Carbon Corporation.