Robert J. Klotzbach

Helen R. Hughes

Helen R. Hughes was a laboratory technician in the Health Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

John C. Pfeiffer Jr.

Tinian Island

John C. Pfeiffer Jr. served in the 393rd Bombardment Squadron.

W. R. Brown

Oak Ridge, TN

Brown worked in the United States Engineer District Office.

J. H. Kistler

T-Plant/200 Areas

Kistler worked in the 200 West Area at Hanford during the Manhattan Project.

Development EngineerX-10 Graphite Reactor

Oak Ridge, TN

EngineerManhattan Project VeteranMilitary VeteranSpecial Engineer Detachment

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