National Museum of Nuclear Science & History
Sappenfield worked at the 300 Area at Hanford during the Manhattan Project.
Dee McCullough began working as an instrument technician at Hanford in early 1944. As a former sound engineer, McCullough was tasked with installing nuclear safety monitors on the reactors at Hanford.
Andrew Walker was a member of the Special Engineer Detatchment (SED) at Los Alamos during the Manhattan Project.
Grover G. Cooper, Jr. served as a staff sergeant in the 393rd Bombardment Squadron.
