National Museum of Nuclear Science & History
Day worked for Stone and Webster Engineering Corporation.
Johnston worked at the 200 West Area at Hanford during the Manhattan Project.
Gavin Hadden was an American civil engineer who served as special assistant to General Leslie R. Groves during the Manhattan Project.
Duffer Crawford worked for the civilian contractor Kellex Coroporation in New York under the supervision of Judson Swearingen.
