Oscar Cogas

Joseph Caldwell

Joseph Caldwell was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

John Tempka

John Tempka (1923-2017) was an American engineer. Tempka was born in Boydsville, Ohio. He was studying at the University of Detroit when he was recruited to join the U.

Lowell P. Aylworth

Aylworth worked in the United States Engineer District Office.

S. C. Combs