Andrew Kapral

Harold E. Hoover

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.

Clayton I. Vogt

Clayton Vogt worked for the United States Engineer District Office.

Ray P. Mitchell

F.C. Pierce

Pierce worked for Stone and Webster Engineering Corporation.