National Museum of Nuclear Science & History
Cloyd Marvin had been drafted into the Army, interrupting his education at Haverford University, in 1943 and joined the Special Engineer Detachment as a technician third grade, later being assigned to Los Alamos National Labs in 1947.
Mathis worked for Stone and Webster Engineering Corporation.
Gifford worked at the 200 West Area at Hanford during the Manhattan Project.
