Homer M. O’Callaghan

Michael J. Haluska

Michael J. Haluska served in the 1027th Air Material Squadron. 

W. T. Sergeant

W. T. Sergeant worked for the United States Engineer District Office.

J. C. Twombly

Walter Groeger

Walter Groeger worked in the shop at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.