Theodore Van Kirk, also known as "Dutch," died Monday of natural causes at the Park Springs Retirement Community in Stone Mountain, Georgia, NBC television reported yesterday.
Van Kirk was 93.
Twenty-four years old at the time, Van Kirk was the navigator on the Enola Gay, a B-29 Superfortress, one of a crew of 12 airmen. The plane dropped "Little Boy" on Hiroshima at 8:15 am August 6, 1945, killing 140,000 people, more than half the population of the city.
"The plane jumped and made a sound like sheet metal snapping" after the explosion, Van Kirk told The New York Times on the 50th anniversary of the raid.
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"Shortly after the second wave, we turned to where we could look out and see the cloud, where the city of Hiroshima had been.
"The entire city was covered with smoke and dust and dirt. I describe it looking like a pot of black, boiling tar. You could see some fires burning on the edge of the city," he added at the time.
On August 15, Japan surrendered.
Historians have long been at odds over whether the twin attacks brought a speedier end to the war by forcing Japan's surrender and preventing many more casualties in a planned land invasion.
Many atomic bomb survivors, known as "hibakusha", oppose both military and civilian use of nuclear power, pointing to the tens of thousands who were killed instantly in the Hiroshima blast and the many more who later died from radiation sickness and cancer.
"It wasn't a matter of going up there and dropping it on the city and killing people," he wrote.
"It was destroying military targets in the city of Hiroshima -- the most important of which was the army headquarters charged with the defense of Japan in event of invasion. That had to be destroyed."
A funeral was scheduled for Van Kirk August 5 in his hometown of Northumberland, Pennsylvania. His burial will be private, CBS reported.