National Museum of Nuclear Science & History
O'Brien worked for Stone and Webster Engineering Corporation.
R. L. Paschall served in the 509th Headquarters and Base Services Squadron.
Robert Holmberg was born in Fort Dodge, Iowa, and began working on the Manhattan Project at the Chicago Met Lab and at Ames Laboratory in Iowa.
Jules Guéron was a French chemist and atomic scientist, who helped develop atomic energy in France. Guéron was born in Tunis on June 2, 1907.
Rex Edward Keller was a member of the Special Engineering Detachment, assigned to work in Seth Neddermeyer’s chemistry group at Los Alamos.