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

John E. Tompkins

K-25 Plant

Attended George Washington University.

J. F. Coker

Y-12 Plant

J. F. Coker worked for the Tennessee Eastman Corporation at the Y-12 Plant.

Walter M. Longfelt

Chicago, IL

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

E. F. Riggs

Y-12 Plant

E. F. Riggs worked for the Tennessee Eastman Corporation at the Y-12 Plant.