National Museum of Nuclear Science & History
Jas Purcell worked for the Roane-Anderson Company.
George Placzek was a Czech physicist. He was born in Brno, Moravia, which was then part of Austria-Hungary but today is in the Czech Republic.
William P. Evans served in the 1st Ordnance Squadron.
Darragh Nagle graduated from Columbia University and worked with Enrico Fermi and Herbert Anderson at the Chicago Pile during the early years of the Manhattan Project.