J. P. Grizzell

Bella Ernst

Henry W. Wigen

Henry Wigen worked for the United States Engineer District Office.

H. G. Singleton

H. G. Singleton worked for the Roane-Anderson Company.

Charles Robert Emigh

Bob Emigh was in the Navy and worked with Deak Parsons on telemetry for the bombs. He was assigned as the science officer for the planned third bomb.