National Museum of Nuclear Science & History
George Royster was a civilian physicist working at the X-10 graphite reactor in Oak Ridge, Tennessee.
Ralph worked at the 300 Area at Hanford during the Manhattan Project.
John P. McBride was a research assistant in the Chemistry Division at the Chicago Met Lab. He was later assigned to Oak Ridge, where he worked on plutonium purification and on isolating uranium-233 isotopes from thorium.
Greenhalgh worked in the United States Engineer District Office.
