National Museum of Nuclear Science & History
N. A. Powell worked for the Kellex Corporation at the K-25 Plant.
Harold Hoover was a member of the Special Engineer Detachment during the Manhattan Project. He worked as a filter foreman at the Y-12 Plant, but his real job was in counterintelligence, to ensure no sabotage occurred.
Harder worked at the 300 Area at Hanford during the Manhattan Project.
