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National Museum of Nuclear Science & History

John C. Matheson

Special Engineer DetachmentLos Alamos, NM

Manhattan Project VeteranMilitary VeteranSpecial Engineer Detachment

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Richard C. Neal

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Harry Truman

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Harry S. Truman (1884-1972) was the 33rd President of the United States of America. Truman first learned of the Manhattan Project after the death of President Roosevelt in April of 1945, when he relinquished his role as Vice President and took the oath of office as the next president of the United States.

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Nelson worked at the 300 Area at Hanford during the Manhattan Project.

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Cicilio Armijo served in the 603rd Air Engineering Squadron.