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National Museum of Nuclear Science & History

John J. Kroes served in the 1st Ordnance Squadron.

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R. L. Helgeson

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

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John A. Simpson Jr. (1916-2000) was a distinguished American nuclear physicist and astrophysicist. Simpson was born on November 3, 1916 in Portland, Oregon.

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