Floyd J. Ritchie

T. J. O’Donnell

T. J. O’Donnell was the Shop Chief at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Earl F. Spring

Earl Spring was a staff worker at Los Alamos during the Manhattan Project.

J. K. Lower

Lower worked in the 200 W Area at Hanford during the Manhattan Project.

O. R. Waldron