National Museum of Nuclear Science & History
Roos worked at the 300 Area and the 200 West Area at Hanford during the Manhattan Project.
Joe M. Madrid served as a corporal in the 393rd Bombardment Squadron. He was a member of the ground crew regularly assigned to the B-29 Some Punkins.
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.
