National Museum of Nuclear Science & History
Leslie Ritner was a member of the Special Engineer Detachment at Los Alamos. He was among the first engineers sent to Los Alamos from Camp Claiborne, Louisiana in late January 1944, serving for two years before being discharged in the spring of 1946.
E. M. Grant worked for the Roane-Anderson Company.
Robert Webster was a member of the Special Engineer Detatchment (SED) at Los Alamos during the Manhattan Project.