J. R. Cathcart

R. W. McMahan

H. V. Appen

H. V. Appen worked for the J.A. Jones Construction Company.

Berlyn Brixner

Berlyn Brixner was hired into Los Alamos in July of 1943. He became a member of the Optical Engineering Group assembled by Professor Julian Ellis Mack to assist in providing optical and camera support for the various groups within the Manhattan Project.

Oswald Greager

Before the war Oswald Greager was a high-ranking DuPont chemist. He took leave from DuPont in 1942 to join the Army's Chemical Warfare Service.