National Museum of Nuclear Science & History
B. R. Longwell served in the 390th Air Service Group.
Part of the Special Engineer Detachment (SED), Donald C. Harms was first sent to Oak Ridge, Tennessee, to work on the Manhattan Project.
Leo P. Hassen was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
W. T. Mann worked for the Tennessee Eastman Corporation at the Y-12 Plant.
