National Museum of Nuclear Science & History
Menges was an Area Engineer and Area Supervisor at the Hanford Engineer Works. He was in the US Navy (USNR) until June of 1943 when he was injured in an explosion on his destroyer.
Chamberlain worked at the 300 Area at Hanford during the Manhattan Project.
Donald Francis Mastick was an American chemist who worked at Los Alamos and on Tinian as part of Project Alberta.