National Museum of Nuclear Science & History
John M. Sprecher was a chemical engineer. During the Manhattan Project, he worked for DuPont in Wilmington, DE.
Treadwell worked at the 100-B and 100-D Areas at Hanford during the Manhattan Project.
Edward Bankowski was a part of the 509th Composite Group stationed on Tinian Island in the Pacific. Specifically, Bankowski was an Aircraft Maintenance Chief with the 603rd Air Engineering Squadron from May to November 1945.
Conner worked in the United States Engineer District Office.
