National Museum of Nuclear Science & History
Harold E. Young was a staff worker at Los Alamos during the Manhattan Project.
Steinbach worked for Stone and Webster Engineering Corporation.
Hughes worked at the 200 West Area at Hanford during the Manhattan Project.
Calvin B. Popwell served as a corporal in the 393rd Bombardment Squadron. He was a member of the ground crew regularly assigned to the B-29 Big Stink, and he and his crew were later reassigned to Luke the Spook.
