Harry M. Betzig

S. I. Allen

J. E. Curran

Curran worked in the United States Engineer District Office.

George Francis McEwen

​George Francis McEwen was born on June 16, 1882 in Manchester, Iowa. He attended Iowa State College.

Leslie G. Ritner

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.