National Museum of Nuclear Science & History
O. R. "Big" Simpson was a second lieutenant in military intelligence in charge of convoys carrying plutonium from Hanford to Fort Douglas, Utah.
Hartley Rowe was an American industrial engineer. Rowe worked on the Panama Canal; for Lockwood Greene, an engineering firm; and for the United Fruit Company, where he rose to become vice president.
Mary Tinsley was a laboratory techinician in the Health Division at the Metallurgical Laboratory in Chicago during the Manhattan Project.
