National Museum of Nuclear Science & History
Technical Sergeant Roderick F. Arnold (1917-1998) was a Flight Engineer assigned to the Bockscar’s original crew.
Leonard worked in the 300 Area at Hanford during the Manhattan Project.
McKenzie worked for Stone and Webster Engineering Corporation.
Helena Calloway was a laboratory assistant in the Chemistry Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
