National Museum of Nuclear Science & History
W. H. Zimmer worked for the United States Engineer District Office.
Agnes McKnight worked for the H. K. Ferguson Company.
Ben Benjamin was a sergeant in the Special Engineer Detachment during the Manhattan Project. He had previously worked in industry making lenses and prisms, and was assigned to the Optics Group to help with photographing the Trinity Test.
H. F. Koch worked for the Tennessee Eastman Corporation at the Y-12 Plant.
