National Museum of Nuclear Science & History
John Riddle was a research assistant at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Born in 1903 in Baltimore, Mackie studied civil engineering at Union College in Schenectady, New York.
Allen worked at the 200 West Area at Hanford during the Manhattan Project.
Alvin P. Goodwin served in the 1st Ordnance Squadron.