Russell E. Gackenbach was a navigator in the 393rd Bombardment Squadron and 509th composite group. He flew on both the Hiroshima and Nagasaki missions. His crew flew aboard the Necessary Evil, which was the camera plane for the Hiroshima mission. Gackenbach photographed the mushroom cloud over Hiroshima. His crew flew again during the Nagasaki mission as the weather reconnaissance plane for the city of Kokura.