Nuclear Museum Logo
Nuclear Museum Logo

National Museum of Nuclear Science & History

Eugene S. Grennan

Flight Engineer on the Straight FlushHiroshima Mission

Tinian IslandWendover, UT
509th Composite GroupHiroshima MissionManhattan Project VeteranMilitary Veteran
The Straight Flush

Eugene S. Grennan served as a 2nd lieutenant in the 509th Composite Group. He was the flight engineer on the Straight Flush during the Hiroshima mission.

Related Profiles

P. E. Cunningham

Hanford, WA

Hugo Leckelt

Chicago, IL

Hugo Leckelt was a laborer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Robert V. Hazel

Los Alamos, NM

Ethol Strom

Chicago, IL

Ethol Strom was a stenographer at the Metallurgical Laboratory in Chicago during the Manhattan Project.