National Museum of Nuclear Science & History
Daniel D. Friel was a chemical engineer for the DuPont Company who joined the Manhattan Project at the University of Chicago in 1943.
Virgil Harris worked on the Manhattan Project at Los Alamos. After the war, he worked for Sandia National Laboratories.
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.