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National Museum of Nuclear Science & History

Frankie R. Johnson

Private 1st ClassTinian Island

Wendover, UT
509th Composite GroupManhattan Project VeteranMilitary Veteran
North Airfield at Tinian Island.

Frankie R. Johnson served in the 393rd Bombardment Squadron.

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Chester J. Krajewski served as a corporal in the 393rd Bombardment Squadron. He was a member of the ground crew regularly assigned to the B-29 Top Secret.

Carl Helmholz

University of California, Berkeley

Carl Helmholz (1915-2003) was an American physicist involved with the Manhattan Project.  Helmholz was born on May 24, 1915 in Evanston, Illinois.