National Museum of Nuclear Science & History
O'Brien worked for Stone and Webster Engineering Corporation.
Coullard worked in the United States Engineer District Office.
George W. Marquardt served as a captain in the 393rd Bombardment Squadron. Although he was regularly assigned to the Up An’ Atom, he flew in the mission to bomb Hiroshima as the aircraft commander of the Necessary Evil.
Ralph N. Devore served as a captain in the 393rd Bombardment Squadron. He was the airplane commander regularly assigned to the B-29 Next Objective.
