National Museum of Nuclear Science & History
Harper worked for Stone and Webster Engineering Corporation.
Paul Lentz served in the 390th Air Service Group.
Joseph Caldwell was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Frank V. Kowalski served in the 1027th Air Material Squadron.
Philip M. Barnes served as a lieutenant in the 1st Ordnance Squadron. He was the assistant weaponeer on Bockscar during the Nagasaki bombing mission.
