National Museum of Nuclear Science & History
Hart worked for Stone and Webster Engineering Corporation.
John Mench was assigned to the Special Engineer Detachment at Los Alamos where he worked as a pattern maker, creating wooden casts for metal work at the site’s foundry.
Leo P. Hassen was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Nelson worked at the 300 Area at Hanford during the Manhattan Project.
